Write-offs: the contractual kind and the kind that hurts

Two different write-offs, two different meanings

Every claim you bill ends up with a gap between the charge and what actually gets collected, and that gap always falls into one of two categories. A contractual adjustment is the portion your payer contract says you were never entitled to bill for in the first place. Bad debt is the portion you were entitled to collect and simply didn't — a real, avoidable loss rather than a contractual fact of doing business with that payer.

The distinction matters because only one of them is a red flag. A high contractual-adjustment percentage usually just means you're in-network with payers who negotiate hard; a high bad-debt percentage means money that was genuinely collectible walked out the door. Both numbers eventually roll into the net income you report on Schedule C 1Ref 1Internal Revenue Service (2026).Self-employed individuals tax center.That practice income rolls up onto Schedule C, the frame both contractual adjustments and bad debt eventually feed., which is exactly why keeping them separate — rather than lumped together as 'write-offs' — matters beyond internal reporting.

Contractual adjustments: money you never had a right to

A contractual adjustment is the write-down between your billed charge and the allowed amount your payer contract sets — it posts the moment the remittance comes back, and it's not optional, negotiable, or a sign anything went wrong with the claim. Most remittance systems flag it with a specific reason code, commonly written as CO-45, and co-45 is not a denial: it's the routine mechanism that brings your charge down to the contracted rate.

Some contractual reductions are mandatory rather than negotiated — sequestration is the standing example, a payment-side reduction applied on top of whatever your contract already set — and it behaves exactly like any other contractual write-off on your books: recorded against the charge, never chased from the patient, never treated as bad debt.

Bad debt: money you were owed and didn't get

Bad debt starts after the contractual math is already done — it's the patient's deductible, copay, or coinsurance, or a payer balance you had every right to under the contract, that stayed unpaid despite statements and follow-up. Unlike a contractual adjustment, nothing about bad debt is automatic: it only becomes a write-off after you've made a genuine attempt to collect and decided further effort isn't worth it.

Because most solo practices run cash-basis books, a bad-debt write-off doesn't work the way it might in a business that recognized the charge as income up front — you never counted the unpaid balance as taxable income to begin with, so there's no separate deduction to claim for writing it off. That's a genuine wrinkle worth a specific check with your preparer rather than assuming it behaves like a typical bad-debt deduction.

A payer balance going to bad debt is rarer than a patient balance, but it happens — a claim adjudicated and approved, then never actually paid because of a processing error the payer never corrected despite follow-up. Treat that differently from a routine denial: it's a collections problem against an entity that already agreed it owed you, which is worth escalating to the payer's provider-relations channel before writing it off as a loss.

The silent-PPO problem that looks contractual but isn't

Not every reduction that shows up looking like a contractual adjustment actually traces back to a contract you signed. silent ppos describes claims repriced by a network you never agreed to, riding on an old contract or a leasing arrangement buried in someone else's agreement — and a reduction like that isn't a legitimate contractual adjustment just because it arrived on the same remittance format.

Write those down separately from your ordinary contractual adjustments while you dispute them — collapsing a disputed repricing into the same bucket as a routine CO-45 write-off means you stop tracking it the moment it's booked, which is exactly what makes a silent-PPO scheme profitable for whoever's running it.

A quick check that catches most of these: does the reduction reference a network name you don't recognize signing with, or a rate that doesn't match your actual fee schedule for that payer? Either signal is worth a phone call before you post the adjustment and move on, since a silent-PPO reduction posted and forgotten is money that's genuinely gone rather than money you were never owed.

Why the distinction changes your real numbers

Net collection rate — payments collected divided by charges after contractual adjustments — is the metric that tells you how much of the money you were actually entitled to, you actually got. Lump bad debt into your contractual-adjustment bucket and that denominator shrinks along with it, making a genuine collections problem look like an ordinary cost of doing business with your payers.

net collection rate: the honest denominator is worth reading in full if you've never separated the two — the short version is that contractual adjustments belong in the denominator's reduction and bad debt doesn't, because bad debt is a failure to collect money the denominator says you should have gotten, not money you were never owed.

Recording both correctly on your books

Give contractual adjustments and bad debt their own separate accounts in your chart of accounts, rather than one shared 'write-offs' line — the first posts automatically off every remittance, the second only after a documented collection attempt has genuinely failed. Reviewing both totals monthly, not just annually, is what turns this from an accounting distinction into something you actually manage.

Keep the underlying documentation — the remittance for a contractual adjustment, the statement history and any collection letters for bad debt — for as long as your general financial records need to be kept 2Ref 2Internal Revenue Service (2026).Recordkeeping.The retention window for financial records, applied to keeping remittance and collection documentation for both write-off types., since either figure could come up if a return is ever examined 3Ref 3Internal Revenue Service (2026).IRS audits.That either write-off figure could be examined, supporting the case for documenting both correctly.. Because net income, not gross charges, is what your quarterly estimated payments should be based on, keeping the two correctly separated is also what keeps those payments accurate 4Ref 4Internal Revenue Service (2026).Estimated taxes.That quarterly estimated payments run on actual net income, the reason accurate write-off separation matters beyond bookkeeping tidiness.. Once you know your real, net-of-both number, paying yourself off of it rather than off gross charges is the more honest version of paying yourself — draws, salary, and distributions covers how that number actually moves into your own pocket by entity type.