BONDING CAPACITY CALCULATOR
Sureties typically extend single-job bonding capacity at 5–10x working capital and aggregate capacity at 10–20x working capital, adjusted by your current ratio and equity position. Enter your working capital, equity, and current ratio below and the calculator estimates a realistic single-job and aggregate bonding range. These are estimates — actual capacity offers depend on the specific surety, your trade, your project history, and your bond agent relationship. But the calculation matches the math sureties actually use.
Bonding capacity isn’t mystery. It’s math. Knowing yours before you ask the surety changes the conversation.
THE STANDARD SURETY FORMULA
Surety underwriting follows reasonably consistent math across most standard construction sureties. The three primary inputs:
- Working capital — current assets minus current liabilities. The single most important number.
- Stockholders equity — retained earnings plus paid-in capital. Used as a secondary capacity check.
- Current ratio — current assets divided by current liabilities. Drives the capacity multiplier within the band.
The calculator below applies the standard multipliers. Sureties with strong relationships, clean track records, and well-prepared financials sometimes extend capacity above these ranges. Sureties dealing with cleanup situations, weak ratios, or unclear financials offer below.
YOUR BONDING CAPACITY
ESTIMATED BONDING CAPACITY
WHAT YOUR NUMBER MEANS
BELOW 1.5x DROPS CAPACITY SHARPLY
The current ratio doesn’t just affect underwriting acceptance — it scales the multiplier applied to working capital. A 1.7x current ratio with $800K working capital might support $5.6M aggregate capacity. The same $800K working capital with a 1.2x current ratio drops aggregate capacity to roughly $4.0M. Same balance sheet dollars, different surety read.
STRONG EQUITY SUPPORTS HIGHER MULTIPLIERS
Working capital drives the primary calculation, but equity acts as a secondary check. A sub with $500K working capital and $2M equity gets read differently than one with $500K working capital and $300K equity. The retained earnings signal years of profitable operation, which surety underwriters value.
SOME TRADES GET HIGHER MULTIPLIERS
Sureties extend wider capacity to trades with predictable production and clean closeout patterns. Civil and underground utility subs at $5M revenue might bond closer to the high end of the range. Trades with retention-heavy work, weather exposure, or complex closeout (waterproofing, EIFS, structural steel) might land at the low end. The calculator gives you the range; the trade context shows where in the range you’ll likely land.
WHAT TO DO NEXT
FIX THE CURRENT RATIO
Aggressive AR collection, restructuring short-term debt to long-term, and WIP schedule cleanup can move the current ratio 0.2–0.5 points without changing operations. That movement changes bonding capacity significantly. See the working capital ratio playbook.
RETAIN EARNINGS
Profitable years that get fully distributed don’t build the equity base. Treating retained capital as strategic investment in bonding capacity changes the math over multiple cycles. Slower lever, but compounding.
CLEAN UP THE FINANCIALS
Most subs we work with see capacity offers improve once the financials are surety-ready — clean POC accounting, accurate WIP schedules, properly classified LOC and equipment debt. Same underlying business, different surety read.
BUILD A RELATIONSHIP WITH A CONSTRUCTION-SPECIFIC SURETY
Generic insurance brokers can write small bonds. Construction-focused sureties extend capacity to subs they know. The relationship matters. A 2-year clean track record with a specialty surety often delivers better capacity than a fresh relationship with a generic broker.
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