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Money math without the spreadsheet headache. Plug in your numbers and I'll show you exactly where the dollars land.
Try a scenario
Click to load — tweak from there.Inputs
Result
Estimated annual bond premium
$500
Rate applied for this tier
2.00%
Raw premium before minimum floor
$500
Effective rate after minimum floor
2.00%
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How to use this
- 1Enter required bond amount (penal sum) ($).
- 2Enter credit tier.
- 3Enter surety's minimum premium ($).
- 4Read your estimated annual bond premium on the right — it updates as you type.
- 5Hit Share to keep the scenario or send it to someone.
About this calculator
A contractor surety bond guarantees to the project owner or licensing authority that you'll perform the work or pay a claim if you don't, and unlike insurance it's not meant to protect you — the surety pays the claim then comes after you to recover it. Premium is quoted as a rate applied to the bond's penal sum (the maximum payout amount), and that rate varies enormously based on your personal credit score and business financial strength, ranging from under 1% for excellent credit to 10-15% for poor credit applicants who need a high-risk 'bad credit bond' program. This calculator applies a credit-tier rate to your bond amount to estimate the premium, since that's the single biggest lever in bond pricing — far more than company size or years in business for smaller contract bonds.
Worked example
Using the values the calculator loads with:
Inputs
- Required bond amount (penal sum): 25000 $
- Credit tier: Good (660-719)
- Surety's minimum premium: 100 $
Results
- Estimated annual bond premium: $500
- Rate applied for this tier: 2.00%
- Raw premium before minimum floor: $500
- Effective rate after minimum floor: 2.00%
What each field means
Inputs
- Required bond amount (penal sum) ($)
- The required bond amount (penal sum) used in the calculation, measured in $. Starts at 25000 $ so you have a working example on load.
- Credit tier
- Pick the option that matches your situation — the maths changes per option. Choices: Excellent (720+), Good (660-719), Fair (600-659), Poor (below 600).
- Surety's minimum premium ($)
- The surety's minimum premium used in the calculation, measured in $. Starts at 100 $ so you have a working example on load.
Results
- Estimated annual bond premium
- Returned as a money amount in US dollars and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Rate applied for this tier
- Returned as a percentage. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Raw premium before minimum floor
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Effective rate after minimum floor
- Returned as a percentage. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
FAQ
Why does my personal credit score matter for a business bond?
Sureties treat a bond like a line of credit they're extending on your behalf, and they underwrite it similarly, weighing your personal credit history heavily, especially for smaller contractors and license bonds under $100,000. A 750 credit score contractor might pay under 1% while a 580 score contractor pays 10-15% for the identical bond amount and obligation.
What happens if a claim is paid against my bond?
The surety pays the claimant, but then legally comes after you (and often your personal guarantee, since most bond applications include one) to recoup every dollar paid plus legal costs, since the bond is not insurance protecting you — it protects the party who required it. A paid claim can also make you uninsurable or force you into much higher-rate bad-credit bond programs going forward.
Can I get a bond with bad credit?
Yes, through bad-credit or high-risk surety programs, though rates run 8-15% of the bond amount versus under 2% for good credit, and some sureties require full or partial collateral upfront. Building better credit and reapplying after 6-12 months, or shopping multiple bad-credit surety markets, can meaningfully reduce cost.
Is a license bond the same as a performance bond?
No. A license bond is typically a smaller, flat amount required by a state or city to get licensed, guaranteeing general compliance with laws and regulations. A performance bond is project-specific, sized to the contract value (often 100% of it), guaranteeing you'll complete that specific job, and is priced and underwritten separately per project.
Accuracy and limitations
- Results are estimates before tax, fees, and inflation unless an input explicitly covers them.
- Rates are treated as fixed for the whole period — variable-rate products will drift from this projection.
- This is educational maths, not financial advice. Check anything contractual with the lender or your accountant.
Related tools
Cite this calculator
Writing about this topic? Grab a citation — every link helps keep these tools free.
RevenueLab. (2026). Contractor Surety Bond Premium Estimator. Retrieved from https://www.revenuelab.fyi/toolbox/contractor-bond-premium-estimate
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/contractor-bond-premium-estimate" target="_blank" rel="noopener">Contractor Surety Bond Premium Estimator — RevenueLab</a> (2026).</p>
Source: [Contractor Surety Bond Premium Estimator — RevenueLab](https://www.revenuelab.fyi/toolbox/contractor-bond-premium-estimate) (2026).