Surety Bond Premium Calculator: Find the Right One and Understand Your Estimate
Most online surety bond calculators give you one number. Ours give you 35 — because there are 35 different bond categories with different rate math. Every competitor calculator we audited collapses surety pricing into a single formula (“contract value times one rate”) and then disclaims the result. That math is correct for exactly one of the six categories the industry actually uses, and wrong for the other five.
This guide is a routing layer over our calculator suite. It tells you which calculator matches your bond category, the rate-formula mechanic that calculator runs, and the five underwriting variables no calculator on the public web can read. If you want the depth on a single bond type — say, the two-axis sliding scale for performance bonds — the how to calculate a performance bond guide runs that math end to end. This page sits one level above and points you there.
The calculator decision tree: which one to open
Pick the row that matches your bond need. Every row routes to a specific calculator with the rate-formula mechanic that calculator actually applies. The footnotes break down why those formulas differ — every calculator on our site speaks the math of its category, which is why we maintain 35 of them instead of one.
Bond category → calculator → rate-formula mechanic
Backbone of this guide. Each row maps a bond category to its dedicated calculator, the rate math that drives it, SBA eligibility, and the typical premium range a clean-credit applicant should expect.
| Bond category | Use this calculator | Rate-formula mechanic | SBA-eligible? | Typical premium range |
|---|---|---|---|---|
| Contract surety (federal, state, private) | performance-bond / bid-bond / payment-bond / construction-bond | Sliding scale on contract size + credit multiplier | Yes (up to $9M non-federal / $14M federal as of Mar 18, 2024) | 0.5%–3.0% of contract |
| License / commercial (state board) | contractor-license-bond / auto-dealer-bond / freight-broker-bond / mortgage-broker-bond | Flat rate on state-set bond amount | No | 1%–3% of bond amount |
| Trade contractor license | hvac-contractor-bond / electrical-contractor-bond / plumbing-contractor-bond / roofing-contractor-bond | Flat rate on state-set bond amount (often $5K–$25K) | No | 1%–3% of bond amount |
| Court / probate / fiduciary | court-bond / probate-bond / appeal-bond / guardian-bond / executor-bond | Percentage of judge-ordered penal sum | No | 0.5%–2% of bond amount |
| Customs (import) | customs-bond / single-entry-customs-bond / temporary-import-bond | CBP amount formula × carrier filed rate | No | Per CBP rules (continuous = 10% prior-year duties, min $50K) |
| Specialty flat-rate | notary-bond / erisa-bond | Statute-set bond amount, flat fee (no credit check standard) | No | Notary: $30–$80 / 4-yr term; ERISA: 0.1%–0.5% of bond |
| Capacity planning (not pricing) | bonding-capacity | Working-capital and net-worth based (10x / 20x rule) | N/A — informational | Outputs maximum bondable single-job and aggregate exposure |
Premium ranges reflect industry-standard filed-rate bands for applicants in the 740+ FICO Excellent band. Move to Good (670–739) and rates step up roughly 25–40%. Move to Fair (580–669) and rates can step up 100–300% or trigger collateral. Below 580, most preferred carriers decline and the file routes to standard market or the SBA Bond Guarantee Program.
Sources: NASBP surety bond category framework (nasbp.org/about/about-surety/); SBA Surety Bond Guarantee Program statutory limits effective March 18, 2024 (sba.gov); CBP “A Guide for the Public: How CBP Sets Bond Amounts” (February 2024); calculator inventory confirmed against /tools/calculator/ on May 13, 2026.
Contract surety
Performance bond calculator
Sliding-scale federal/state/private — use with payment-bond on Miller Act and Little Miller Act jobs.
Contract surety
Bid bond calculator
Penal sum typically 5–20% of bid (Miller Act floor is 20% for federal). Usually flat-fee priced at this scale.
Contract surety
Construction bond calculator
Project-size sliding scale, applies to commercial construction outside the public- works statute regimes.
Capacity (not pricing)
Bonding capacity calculator
Open this first if you do contract work — it tells you the maximum single-job and aggregate exposure carriers will accept before any premium math matters.
License / commercial
Contractor license bond
State-board mandated bond amount, flat-rate premium (typically 1–3%). Varies by state — California CSLB is $25K, Florida CILB is $10K–$50K depending on classification.
Specialty
Title bond calculator
Vehicle/property title disputes. State DMV sets the bond amount as a multiple of appraised value (commonly 1.5×).
Court / probate
Court bond calculator
Routes to probate, appeal, guardian, executor, or fiduciary depending on case type. Penal sum is judge-ordered — calculator only sizes the premium.
License / federal
Freight broker bond calculator
Fixed $75,000 BMC-84 bond per FMCSA. Premium prices off the principal’s credit — most volatile single-input calculator on the site.
Specialty flat-rate
Notary bond calculator
State-statute bond amount (California: $15K under Gov. Code § 8213). No credit check on the standard 4-year term — most accurate calculator on the site.
License / DMV
Auto dealer bond calculator
State DMV-mandated amount; flat-rate premium. Tier varies by dealership type and state — California is $50K, Texas is $25K–$50K.
License / NMLS
Mortgage broker bond calculator
State NMLS-set bond amount ($25K–$500K by state, often volume-tiered). Flat rate, credit-checked. Multi-state brokers stack bonds per state.
Customs
Customs bond calculator
CBP bond amount = 10% of prior-12-month duties/taxes/fees, minimum $50,000 (continuous). Single-entry uses entered value + duties.
Specialty flat-rate
ERISA fidelity bond calculator
ERISA § 412: bond = 10% of plan assets, $1,000 statutory minimum, $500K cap (or $1M for plans holding employer securities).
For the full list of 35 calculators in one place, see the calculator hub. Trade-specific calculators (general contractor, residential contractor, mechanical contractor, pest control) live on the hub and follow the license/commercial flat-rate mechanic on a state-set bond amount.
Send your bond profile to a producer
The form routes to the right carrier filed-rate band based on bond type, state, and credit. Cross-product intake — use this form for license bonds, court bonds, freight broker bonds, contractor bonds, customs bonds, and most specialty lines. If you need a contract surety quote specifically (federal Miller Act, state Little Miller Act, AIA A312), the form still works — your state and bond amount route the file accordingly.
- ✓Treasury Circular 570 carriers for federal contracts
- ✓State-admitted carriers for license, court, and commercial bonds
- ✓SBA Bond Guarantee Program submission on contracts up to $9M / $14M
- ✓Flat-rate instant approval on qualifying license and notary bonds
How each calculator does the math (six rate-formula families)
Each of the six categories below uses a structurally different formula. The calculator you opened from the decision tree above runs exactly one of these. Mismatch the category and the estimate is wrong — sometimes by an order of magnitude. The worked example for each family is the math the calculator runs end to end.
The state board or federal agency sets the bond amount (FMCSA: $75,000 freight broker BMC-84; CSLB: $25,000 California contractor license; varies by state elsewhere). The carrier applies a flat percentage to that amount. Credit moves the percentage; the bond amount does not move. Below the carrier’s credit-check threshold (often $25K bond amount), some carriers issue instant-approval at a fixed rate.
License/commercial flat-rate formula
Bond amount per California Business & Professions Code § 7071.6 ($25,000 CSLB requirement). Premium rate band 1%–3% is industry-standard for license/commercial bonds per the NASBP Commercial Surety category framework; specific carrier rates are filed proprietarily with the California Department of Insurance.
Contract bonds do not price flat. Carriers file sliding-scale rate schedules with state insurance departments — the first dollars of bond exposure cost more per dollar than the last dollars, because underwriting cost (financial statement review, indemnity package, credit pull) is roughly fixed regardless of bond size. The mechanic for this category, including the credit-tier multiplier that stacks on top of the size base, is broken down end-to-end in the how to calculate a performance bond guide.
Contract bond sliding-scale formula
NASBP cites contract surety premiums in the 0.5%–3.0% range. Size-bracket base rates shown reflect industry-standard filed-rate patterns, not a regulated rate. The Miller Act (40 U.S.C. § 3131) and FAR 28.102 regulate bond amounts, not premium percentages.
Court bonds price as a percentage of a court-ordered penal sum. The applicant does not choose the bond amount — the judge does, often as a multiple of the estate value (probate, executor, guardian), the judgment amount (appeal bonds, typically 125–150% of judgment), or the contested amount. The calculator only sizes the premium on the court’s number.
Court / probate bond formula
Rate range 0.5%–2% for court/probate bonds is consistent with the NASBP Commercial Surety — Court/Judicial and Fiduciary/Probate categorization and matches our internal court-bond calculator rate table (minRate 0.005, maxRate 0.02).
Customs is the one category where a federal agency sets the bond amount formula with public documentation. CBP’s February 2024 “A Guide for the Public: How CBP Sets Bond Amounts” fixes the rules: continuous customs bond amount equals 10% of prior 12-month duties, taxes, and fees, with a $50,000 statutory minimum (per 19 CFR Part 113 and CBP Customs Directive 3510-004). Single-entry bond amount equals total entered value plus duties, taxes, and fees on the shipment. CBP does not set the premium — the surety carrier does, filed with state insurance departments.
Continuous customs bond formula (CBP-set amount)
Bond amount formula per CBP “How CBP Sets Bond Amounts” (February 2024), 19 CFR Part 113, and CBP Form 301. Premium rate is carrier-filed with state DOI — the figure shown reflects industry-standard pricing for a low-claim importer, not a regulated rate.
These bonds price on statutory bond amounts and flat carrier fees with no individual credit underwriting on the standard term. The notary calculator is the most accurate calculator on our site because there is no credit variable to blur the estimate. California Government Code § 8213 fixes the California notary bond at $15,000 and the standard 4-year-term premium is typically $40–$50; the bond amount cannot be negotiated. ERISA bonds are federally required at 10% of plan assets under ERISA § 412, with a $1,000 statutory minimum and a $500,000 cap (or $1,000,000 for plans holding employer securities).
Specialty flat-rate formula (notary)
California bond amount: California Government Code § 8213. Premium range is industry-standard published pricing for a 4-year California notary commission — not a regulated rate. Bonds in other states have different statutory amounts and different flat fees.
Open this before a contract bond calculator. The bonding capacity tool applies the industry working-capital and net-worth ratios (the 10× net-working-capital rule for single-job limits and the 20× rule for aggregate exposure) to size the maximum bond a carrier will likely write before reviewing project specifics. If you put a $5M contract into the performance-bond calculator and your working capital can only support $1.2M of bonded exposure, the premium estimate is irrelevant — the bond will not bind. Bonding capacity sequences first, premium math sequences second.
Five underwriting variables no calculator can read
A calculator runs the rate math its category was built for, accurately, with the information you typed in. What it does not do is read the underwriting file the carrier actually reviews. Five variables move the bound premium away from the estimate — sometimes inside the rate band, sometimes across two bands.
Practical rule. Use the calculator as a budgeting range, not a quote. If the bond is in the license/commercial, court, customs, or specialty flat-rate categories with a clean credit profile, the estimate is typically within 10–20% of bound premium. If the bond is contract surety above $250K, expect the carrier’s number to move on the financial statement review even if the calculator looks clean. If any of the five variables above apply, the calculator number is a starting point — not a price.
The FICO band that drives every category except specialty flat-rate
Five of the six categories above run a credit-tier multiplier on top of their base formula. The bands carriers actually use track the FICO categories published by myFICO. Below is the multiplier pattern across the credit spectrum on a typical license-bond category bond amount of $25,000 — the most common single-line bonded exposure on the site. Move to contract surety and the same bands apply but stack on the sliding-scale base rather than a flat rate.
License/commercial bond pricing by FICO band
Based on a $25,000 bond amount
- Exceptional (800–850)Rate: 0.5%–1.0%$125–$250 / yr
- Very Good (740–799)Rate: 1.0%–1.5%$250–$375 / yr
- Good (670–739)Rate: 1.5%–2.5%$375–$625 / yr
- Fair (580–669)Rate: 3%–5%$750–$1,250 / yr
- Poor (300–579)Rate: 5%–15%+$1,250–$3,750+ / yr · collateral likely
FICO bands per myFICO consumer credit education materials. Premium percentages reflect industry-standard filed-rate patterns for license/commercial bonds, not a regulated rate. Within each band, carriers apply proprietary sub-tiers — a 720 FICO and a 745 FICO can quote differently inside the Very Good band depending on the carrier’s internal cutoffs.
Contract surety stacks the same multiplier pattern on top of the size-bracket base rate — a 720 FICO indemnitor on a $1M federal Miller Act bond prices at roughly 1.25× the 740+ base, which the performance bond calculation guide walks step by step. Specialty flat-rate bonds (notary, ERISA) bypass the credit band entirely on the standard term.
Who regulates what in calculator math (it isn’t one agency)
The most-repeated misunderstanding on surety calculator pages is that one agency sets the price. No agency does. Three regulatory regimes touch surety bond pricing, and they touch different parts of the math.
Official Federal procurement Requirements
"Paraphrase of FAR 28.202 and FAR 28.102-2: Performance bonds must be obtained from corporate sureties listed in Department of the Treasury Circular 570. The penal amount of performance bonds must equal 100 percent of the original contract price."Federal Acquisition Regulation — FAR Subpart 28.2 (paraphrase of FAR 28.202 + FAR 28.102-2) • FAR 28.202 / FAR 28.102-2
Open the right calculator now — or skip ahead to a quote
Every category above routes to a dedicated calculator on the calculator hub. If you already know your bond type and state, the get-quote intake pulls a real number from a Treasury-listed or state-admitted carrier instead of a published rate range.
Why the numbers diverge. A calculator runs a single equation: filed rate for the applicable credit band × bond amount. It is an accurate estimate of the headline math — but it only processes the inputs the applicant supplies. An underwriter processes the full file, and four categories of underwriter adjustment routinely push the bound quote above the calculator figure.
1. Credit-band edge discretion. Every carrier sets internal FICO cutoffs that do not align with the consumer-education band boundaries (800 / 740 / 670 / 580) used by calculators. A carrier may cut its Exceptional-rate tier at 790, not 800. A self-reported score of 795 lands in the Exceptional calculator band; a soft pull at 788 lands in the carrier’s Very Good tier. The rate difference is real; the calculator cannot see it.
2. Financial-statement adjustments. Contract surety carriers underwrite the principal’s balance sheet, not just the credit score. Working capital, net worth relative to aggregate bonded exposure, and current-ratio trends all feed the underwriting decision. A contractor at 740 FICO with a thin working-capital position can price at the same rate as a 680-FICO contractor with strong financials — or higher. No public calculator accepts financial statements as an input.
3. Claim-history surcharges. A disclosed prior bond claim triggers a surcharge band at most preferred carriers. The surcharge is applied by underwriter discretion within the carrier’s filed rate flexibility; it is not a fixed multiplier. Calculators have no claim-history input, so the baseline estimate always reflects a clean file — the gap between estimate and bound quote is entirely the surcharge band.
4. Project-specific surcharges. Non-standard parameters — design-build delivery, environmental remediation scope, advance-payment bonds under FAR 28.106-1, retroactive bonding on a change order — sit outside the rate filing’s standard assumptions. Carriers add a line-item surcharge or decline the standard-market filing entirely and quote off a manuscript form. Both outcomes produce a number the calculator cannot anticipate.
The underlying principle. A calculator prices the inputs you gave it. An underwriter prices the inputs you gave it plus the inputs the file discloses. Both are internally consistent — the discrepancy is not an error in either number, it is the difference between the visible portion of the risk and the full risk. The producer’s desk runs the same four checks on every file before routing to a carrier, which is why the intake form collects more than a calculator does.
Quote a file that won’t fit a calculator? The producer team handles complex underwriting nationally — disclosed claims, financial-statement-tight files, contract surety above $5M, customs bonds with non-standard prior-year duty profiles, court bonds with unusual penal sums. Use the form above, the get-quote intake, or call 1-844-810-BOND.
Eric Drummond
Licensed Surety Producer (license pending)
- Nevada: License #Pending issuance (All Bond Lines)
- ✓Surety bond producer training (NASBP coursework)
All content is researched from official state and federal sources (.gov) and reviewed by surety bond specialists. We maintain direct integrations with Treasury-certified surety carriers rated A- or better by AM Best.
Why does your site have 35 different surety bond calculators instead of one?
Because surety pricing math is not one formula. NASBP separates surety into Contract Surety (performance, payment, bid, warranty) and Commercial Surety (license/permit, court/judicial, fiduciary/probate, public official, miscellaneous), and those buckets price on fundamentally different mechanics. A contract bond runs a sliding scale that gets cheaper per dollar as the bond grows. A license bond runs a flat rate on a state-mandated bond amount. A court bond runs on a judge-set penal sum. A customs continuous bond uses CBP’s 10%-of-prior-12-month-duties formula (minimum $50,000) per the February 2024 CBP public guide. A notary bond is a flat fee on a statutory bond amount (California’s is $15,000 under Government Code § 8213). A single calculator using one formula across all 35 of those bond types would be wrong four ways out of five.
How accurate is the premium estimate any surety bond calculator gives me?
Inside the correct rate category and with a clean credit profile, the calculator estimate is usually within 10–20% of a bindable quote. Outside that profile, the gap widens fast. Five underwriting factors no calculator can read: (1) FICO position within a tier — a 720 and a 745 land in the same Very Good band but can quote differently at the same carrier; (2) financial statement strength (working capital, net worth, debt-to-equity), which NASBP confirms is a primary underwriter input on bonds above roughly $250K–$500K; (3) prior claim history — surety is credit, not insurance, so a paid claim record materially impacts pricing; (4) project-specific carrier appetites (design-build, environmental, fast-track, hot-state work); and (5) market cycle — SBA’s FY2025 surety guarantees hit $10.6 billion, up 15% year-over-year, signaling a tight-capacity market where standard rates may not bind.
I just need to know my bond price. Which calculator should I open right now?
Pick the calculator that matches your bond category, not your trade. If you bid public construction — use the bid-bond, performance-bond, payment-bond, or performance-and-payment-bond calculator. If a state license board mandates your bond — use the contractor license bond, auto-dealer-bond, freight-broker-bond, or mortgage-broker-bond calculator. If a trade-specific bond — use the HVAC, electrical, plumbing, or roofing calculator. If a court ordered the bond — use the court-bond, probate-bond, or appeal-bond calculator. If you import goods — use the customs-bond calculator.
Does Treasury Circular 570 set the bond premium rate?
No. Treasury Circular 570 is a carrier-eligibility list, not a rate schedule. Under FAR 28.202 and 31 U.S.C. § 9304–9308, federal-contract sureties must appear on Circular 570 with sufficient underwriting limitation, but Treasury sets no premium rate — it only certifies which carriers can write federal bonds. Surety premium rates are filed by each carrier with each state’s Department of Insurance via the NAIC SERFF platform, and filings are not public. The rate ranges shown in our calculators reflect industry-standard filed-rate bands, not a regulated rate.
I have a small business with a $1.5M federal contract — does SBA backing change my calculator output?
Yes, in two ways. First, the SBA Surety Bond Guarantee Program lets a marginal-credit contractor obtain a bond at preferred-market rates because the SBA backstops the carrier. Second, SBA charges a 0.6% guarantee fee on performance and payment bonds (no fee on bid bonds), which must be added to the surety premium. Effective March 18, 2024, the SBA raised contract limits to $9 million on non-federal and $14 million on federal contracts — a $1.5M federal contract is well inside the SBA-eligible band. Calculator outputs typically do not add the SBA fee — do that on top of the displayed premium when the file routes through SBA.
When should I skip the calculator and just talk to a producer?
Four scenarios where the calculator estimate misleads more than it helps. (1) Any contract bond above roughly $5M — large-job pricing is negotiated against the carrier’s aggregate-capacity treaty and reinsurance terms, not a filed rate schedule. (2) Any applicant with a prior surety claim — a calculator cannot price the claim record, but a carrier will. (3) Any project with non-standard parameters (design-build, environmental remediation, advance-payment bonds under FAR 28.106-1, retroactive bonding on a change order). (4) Any applicant in the Fair or Poor FICO band — preferred carriers decline most of these files and the bond routes to standard market or SBA-guaranteed channels at materially different rates. In all four cases, the producer’s desk does the math the calculator cannot.
If you want the depth on a single bond category instead of the routing layer, start with the how to calculate a performance bond guide — it walks the two-axis sliding scale and credit multiplier end to end with three worked examples (federal Miller Act, California PCC § 7103, private AIA A312). For broad pricing context across every category, the surety bond cost guide consolidates rate factors across contract, license, court, and specialty bonds. For the application and underwriting process underneath the math, the how to get a surety bond guide covers the bond application lifecycle from indemnity to issuance.
For the bond product pages that match each calculator family: contract surety lives at the performance bonds hub; state contractor licensing lives at the contractor license bonds hub; notary lives at the notary bonds hub; freight broker BMC-84 bonds at the freight broker bonds page. The calculator hub lists all 35 calculators with one-line descriptions if you want to browse rather than route via the decision tree above.
To submit a real quote intake instead of an estimate, open the cross-product get-quote intake or call 1-844-810-BOND. New to surety? Start at the top-level surety bond learning center or the homepage BuySuretyBonds.
Route to the right calculator, then bind with a real carrier
The decision tree above routes 35 calculators to six rate-formula families. Use the one that matches your bond category, treat the output as a budgeting range, and convert it into a bound bond by submitting an intake. Calculator math handles the visible variables — the producer’s desk handles the rest.