Nothing has to go visibly wrong on a job for a renewal letter to come back smaller.
Short answer
Because a surety re-underwrites your bonding capacity at every renewal against your current financial statements and current backlog, not against last year's approved limit. A thinner working-capital position, a bigger backlog sitting on the same balance sheet, or jobs that are running under-billed can all shrink the number even if you haven't missed a single payment.
BDC describes revenue leakage — “missed or unissued invoices,” “untracked, unbilled scope creep,” pricing that “doesn't keep pace with rising supplier costs” — as something that “happens slowly, month over month,” where sales look strong while the money quietly slips away. That's exactly the kind of erosion a surety's year-end review picks up before the company itself notices it, because it shows up as thinner working capital relative to backlog, not as a loss on any single job.
Backlog itself is part of the math: the more uncompleted contract value you're carrying against the same working capital and equity, the more risk a surety reads into the file — which means winning more work, on an unchanged balance sheet, can shrink headroom rather than grow it. A WIP schedule showing jobs running under-billed is precisely the signal a surety's review is built to catch.
EDC's Account Performance Security Guarantee provides, in its own words, “a 100% unconditional, irrevocable, AAA-rated guarantee to your financial institution,” so that “EDC assumes 100% of your financial institution's risk, allowing your lender to confidently issue guarantees while keeping your working capital available.” It's aimed at exporters who need bid, performance or advance-payment guarantees and want to avoid pledging collateral for them — it doesn't replace a surety bond, but if part of what's tying up working capital is bank-issued letters of guarantee on cross-border work rather than surety-issued bonds, it's a real, no-setup-cost way to free that collateral back up. There's no cost to set it up; you only pay when your lender draws on it, at a pre-agreed monthly rate.
A performance or labour and material payment bond is a different instrument again — a third party guaranteeing performance or payment obligations — and the capacity a surety allocates to those bonds is precisely the number that just moved.
The instinct is to assume the surety is reacting to something specific that went wrong on a job. Often it's just the ratio math on the year-end statements — see this contractor that lost bonding capacity after one bad quarter with no defaulted job behind it.
The other mistake is waiting for the renewal letter to find out. Sharing interim financials proactively — especially after a working-capital-heavy quarter, or after tripping a loan covenant — gives the surety time to work with you instead of simply recalculating the ceiling on its own schedule.
A 30-minute call is enough to tell you whether your pricing, bonding or collections process is leaking margin.
