Guide

The expense lines, in order, and what each should be doing

Summary

There is no target expense percentage for a cash-pay practice, and the closest public benchmark is an IRS aggregate rather than a rule: sole proprietorships in ambulatory health care reported total deductions of roughly 63 cents per dollar of receipts in tax year 2022, ranging from about 48 percent in mental-health offices to about 74 percent in dental ones. The number worth tracking is your own: each line as a share of what you collected, recomputed every month.

By Gale Editorial · Updated 2026-09-02. Every figure cited to a dated source. How we write.

What should the expense lines add up to?

No single percentage is right, and the closest thing to a public benchmark is a government spreadsheet of aggregate totals. In tax year 2022, the most recent year in the series and released in October 2024, sole proprietorships filing under Ambulatory Health Care Services reported roughly $105.4 billion in business receipts against roughly $66.3 billion in total deductions 1, which works out to about 63 cents of expense for every dollar collected.

The IRS does not print that percentage. It is a division of two of its own published totals, reported in thousands of dollars across every practice in the sector, so it carries nothing about a practice of any particular size.

The spread underneath it is the part worth having. Total deductions ran about 56% of receipts for offices of physicians outside mental health, about 48% for offices of mental-health practitioners, and about 74% for offices of dentists 1. Those are three businesses with different cost structures filing the same form.

Part II of Schedule C is where all of it lands, in a fixed IRS-numbered sequence that opens at line 8, Advertising 2. That sequence is federal and identical in every state. But the layer sitting on top of it varies: states differ on which business taxes and license fees a practice owes, and on whether they follow the federal rules for expensing equipment, so two practices with identical Part II lines can owe different amounts in different states. Your state department of revenue's business-tax page is the lookup, and it belongs in the same folder as the return.

What the percentages are a percentage of

Collections, and only collections. Under the cash method, the default for a service practice carrying no inventory, gross income is whatever was actually or constructively received during the tax year 3. Nothing earned but unbilled sits on the books. There is no accounts-receivable line, no contractual-adjustment line and no allowance for anything, so the denominator under every percentage on this page is money that reached the account.

A discount never appears anywhere on the return.

The reason is mechanical. A cash-method taxpayer cannot take a bad-debt deduction for an unpaid or discounted fee, because a bad debt requires the amount to have been included in income first, and it never was 4. Sliding-scale work, courtesy adjustments and no-shows are all invisible in Part II; they show up only as a smaller top line.

That shapes what the monthly close is for. Read collections first, then the lines against them, because a month where the percentages jumped is usually a month where the denominator fell.

The lines that carry the most weight

Payroll, first and by a distance. In the same 2022 ambulatory aggregate, salaries and wages was the largest single identified expense line at roughly 14% of receipts, followed by the unitemized other-business-expenses catch-all at roughly 11%, rent on business property at roughly 4%, and supplies and contract labor at roughly 3.5% to 4% each 1. Everything else on the form sits below those.

Schedule C expense lineAmbulatory health care, 2022 aggregate
Salaries and wagesroughly 14% of receipts
Other business expenses (the Part V total)roughly 11%
Rent on business propertyroughly 4%
Suppliesroughly 3.5% to 4%
Contract laborroughly 3.5% to 4%

The wages line is also where the specialty spread is widest, running from roughly 8% of receipts in mental-health offices to roughly 25% in dental ones 1. A solo practice with no employees reports nothing there at all.

The largest line in the benchmark is the one most likely to read zero on a solo return.

The insurance line will not tell you what malpractice costs. It carries malpractice together with the general liability, property and cyber policies a practice buys, and nothing in the public data separates them, so no malpractice figure can be read out of it.

Where the software stack lands

Part V, not the office-expense line. The Schedule C instructions scope line 18, Office expense, narrowly to office supplies and postage, while Part V, Other Expenses, carries Technology and software tools as a named category, with the Part V total flowing back to line 27b 5. A practice-management subscription, a telehealth seat and a scheduling tool belong in Part V, itemized by name.

Past that, the mapping is convention. The IRS does not adjudicate whether a credentialing fee, a billing service or a clinical supervision hour belongs on legal and professional services, on contract labor or in Part V, and practices place them differently. Pick a placement, write it down and keep it stable across years. A line that moves between categories cannot be compared with itself.

It is also the argument for buying the stack in order. Each subscription lands in Part V as its own named row, which is what lets a January review say what a year of tooling cost and which seat nobody opened.

The home office line and its ceiling

It is capped, and the cap is low. The simplified method for business use of a home pays a flat $5 per square foot of qualifying space, limited to 300 square feet, for a maximum deduction of $1,500 a year, with no substantiation of actual costs required 6. A practice run from a spare room reaches that ceiling at 300 square feet and stops there, whatever the mortgage or the lease says.

A second method computes the real share of real costs, and it is a longer calculation carrying substantiation with it. Whether the extra work pays depends on the space and the housing cost around it, which is arithmetic to run once with a CPA.

But the line matters more for what it does to the rent percentage than for the deduction itself. A practice working from home reports close to nothing on rent while the benchmark's rent line sits near 4% of receipts 1, so its total expense share should land below the aggregate for that reason alone, before any judgment about whether it is running lean.

The two biggest numbers that are not expense lines

Self-employment tax and the owner's own pay, neither of which appears in Part II. Schedule SE computes the first from net earnings multiplied by 92.35%, then applies 12.4% for Social Security up to the wage base, which is $176,100 for 2025, and 2.9% for Medicare with no cap; one half of the resulting tax is deductible 7. It lands after every expense line has been counted.

That is what makes a 63% expense benchmark misleading as a planning figure. A practice holding expenses to 55% of collections has not kept 45 cents on the dollar. It has kept 45 cents before self-employment tax, before income tax and before anything set aside for the months when the schedule is thin.

The working figure is what survives the tax sweep, not the expense ratio. Setting the tax percentage aside on each deposit keeps the two questions apart: what the practice spends, and what it owes.

Computing your own, month by month

Divide each Part II line by the same month's collections, and keep the series. A year of a practice's own percentages is worth more than any aggregate, because the aggregate blends every practice size and every specialty in the sector and stops at tax year 2022 1. Two things make the series useful: the direction each line is moving, and the month a line moved with no decision behind it.

  • Compute against collections, since collections are the only revenue figure the return recognizes.
  • Hold the category mapping steady across years, so each line can be compared with itself.
  • Watch the three largest lines and leave the small ones alone until one of them doubles.

One structural difference keeps a cash-pay percentage from lining up with an insured practice's. The billing apparatus an insured practice funds, from claim scrubbing to appeals to handling prior auth as a solo, is work a cash-pay practice never performs, and the labor and software behind it never reach its Part II lines. A common convention is to compare only against practices on the same payment model, and where none is available, against last year.

So the answer is a range with a method under it: roughly 63 cents on the dollar across the sector in 2022, roughly 48 in mental-health offices and roughly 74 in dental ones 1, with your own twelve months underneath all three. Take the category placements and any election to a CPA before the return is filed; the monthly series is yours to keep either way.

Common questions

No published rule sets one. The nearest public figure is an IRS aggregate for tax year 2022, where sole proprietorships in ambulatory health care reported total deductions of roughly 63 cents per dollar of receipts, ranging from about 48 percent in mental-health offices to about 74 percent in dental ones. It blends every practice size in the sector, so it identifies an unusual line rather than setting a target.

Because the fee was never income. A cash-method practice reports what it received, so a sliding-scale reduction or a written-off balance simply lowers collections. The IRS is explicit that a bad-debt deduction requires the amount to have been included in income first, which never happened here. The effect is a smaller top line and no offsetting deduction anywhere in Part II.

Part V, Other Expenses, which flows to line 27b. The instructions scope line 18, Office expense, narrowly to office supplies and postage, and Part V carries Technology and software tools as a named category. Subscriptions listed there by name are easier to review than a single lump. Where a credentialing fee or a billing service belongs is convention, so pick a placement and hold it across years.

Under the simplified method, $5 per square foot of qualifying space, capped at 300 square feet, for a maximum of $1,500 a year with no substantiation of actual costs. A larger room does not raise it. The alternative method computes the real share of real housing costs and requires records behind it, and whether that extra work pays is arithmetic to run once with a CPA.

No. It is computed on Schedule SE from net earnings multiplied by 92.35 percent, with 12.4 percent for Social Security up to the wage base of $176,100 for 2025 and 2.9 percent for Medicare with no cap, and one half of the resulting tax is deductible. It arrives after Part II is finished, which is why an expense ratio overstates what a practice keeps.

Usually payroll and rent. Salaries and wages is the largest single line in the 2022 aggregate at roughly 14 percent of receipts, and a practice with no employees reports nothing there; a practice working from home reports close to nothing on rent against a benchmark line near 4 percent. Two absent lines move the total well before any judgment about spending discipline.

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References

  1. 1.Internal Revenue Service, Statistics of Income (SOI) Division (2022). Table 2. Nonfarm Sole Proprietorships: Income Statements, by Industrial Sectors, Tax Year 2022. IRS SOI Tax Stats -- Nonfarm Sole Proprietorship Statistics (irs.gov/pub/irs-soi). link ✓The tax-year-2022 aggregate expense benchmark and its spread: roughly $105.4 billion in business receipts against roughly $66.3 billion in total deductions for Ambulatory Health Care Services sole proprietorships (about 63% of receipts), about 56% for physician offices, about 48% for mental-health offices and about 74% for dental offices, plus the individual line shares (salaries and wages about 14% of receipts, other business expenses about 11%, rent about 4%, supplies and contract labor about 3.5% to 4% each, and the wages line running from about 8% to about 25% by specialty). Every percentage is stated in the article as this article's own division of two IRS-published aggregate totals for tax year 2022, not a percentage the IRS states.
  2. 2.Internal Revenue Service (2025). Schedule C (Form 1040), Profit or Loss From Business (Sole Proprietorship). IRS.gov. link ✓The form's own layout and line numbering: Part II Expenses is a fixed, IRS-numbered sequence that opens at line 8, labeled Advertising.
  3. 3.Internal Revenue Service (2022). Publication 538 (01/2022), Accounting Periods and Methods. IRS.gov. link ✓The cash method's income rule, that gross income is what was actually or constructively received during the year, and that accrual is required only where merchandise is an income-producing factor, so a service-only practice can stay on the cash method. Used for the claim that collections are the denominator under every expense percentage.
  4. 4.Internal Revenue Service (2026). Topic no. 453, Bad debt deduction. IRS.gov Tax Topics. link ✓That a cash-method taxpayer cannot take a bad-debt deduction for an unpaid fee, because the deduction requires the amount to have been included in income first. Used to explain why a discount or a write-off never appears as an expense line.
  5. 5.Internal Revenue Service (2025). Instructions for Schedule C (Form 1040), Profit or Loss From Business. Internal Revenue Service. link ✓The line mapping for a practice's software stack: line 18, Office expense, is scoped narrowly to office supplies and postage, while Part V, Other Expenses, carries Technology and software tools as its own named category, with the Part V total flowing to line 27b.
  6. 6.Internal Revenue Service (IRS) (2025). Publication 587 (2025), Business Use of Your Home (Including Use by Daycare Providers). IRS.gov. link ✓The simplified home-office method's arithmetic: $5 per square foot, limited to 300 square feet, for a maximum $1,500 annual deduction with no substantiation of actual costs required.
  7. 7.Internal Revenue Service (2025). Schedule SE (Form 1040): Self-Employment Tax. Internal Revenue Service. link ✓The self-employment tax arithmetic that sits below the Part II expense lines: net earnings multiplied by 92.35%, 12.4% for Social Security up to the $176,100 wage base for 2025, 2.9% for Medicare with no cap, and the deduction for one half of the tax.

https://www.gale.care/for-providers/se-cash-pl-line-by-line · 7 sources. Competitor details are cited to dated public sources and maintained as they change; figures are estimates, not commitments. Synthetic demonstration.

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