Bookkeeping and Taxes for a Solo Pilates Business (US)

You became a Pilates teacher to teach Pilates. Then the first year ends, and someone asks for your mileage log, your pack balances and whether you paid estimated taxes. If that feels like a second job nobody trained you for, that's a very common feeling.

This guide covers the parts of the money side that tend to trip up solo teachers in the US: how session packs complicate "income," which costs are commonly deducted, quarterly estimates, the forms you might see, and what records make tax season easier. Wherever there's a real choice, it lays out the options.

Cash vs earned revenue when you sell packs

Packs are where Pilates bookkeeping gets interesting. When a client pays $1,100 for a 10-pack in December and uses most of it in January and February, which year did you "make" that money?

There are two common ways to think about it.

• Cash basis: income counts when the money arrives. Simple, and it's how many sole proprietors keep their books. The December pack is December income.
• Accrual or earned basis: income counts when you deliver the session. The pack is a liability until it's used. A 2026 bookkeeping guide for Pilates studios describes the entry as "a debit to cash and a credit to deferred revenue (a liability)," with revenue recognized as each session is redeemed. The same guide explains that the unused value of expired packs is called "breakage."

Which method you use for taxes is a decision to make with your accountant, and changing it later can involve paperwork. Even if you file on a cash basis, many owners also track prepaid sessions outstanding on the side, because it tells you how much teaching you've already been paid for.

Costs that solo Pilates teachers commonly deduct

The IRS test for business expenses is that they're ordinary and necessary. Publication 334 defines an ordinary expense as "one that is common and accepted in your field of business" and a necessary one as "one that is helpful and appropriate for your business."

Categories that often come up for Pilates teachers:

The mileage rate is a good example of why dates matter. The IRS raised the business rate in the middle of 2026, so a mileage log with dates on every trip is worth more than a yearly total.

Self-employment tax and quarterly estimates

If you work for yourself, nobody withholds tax from your session income. Two things follow from that.

Self-employment tax. The IRS sets it at 15.3%, made up of 12.4% Social Security and 2.9% Medicare, and it applies once net self-employment earnings reach $400. It's on top of income tax, which can come as a surprise in the first year.

Estimated payments. Individuals and sole proprietors "generally have to make estimated tax payments if they expect to owe tax of $1,000 or more" when they file. For 2026, Publication 505 lists the payment due dates as April 15, June 15 and September 15, 2026, and January 15, 2027.

How teachers set money aside varies:

• A fixed percentage of every deposit moved to a separate savings account. Simple, and it doesn't need accurate forecasts. Your accountant can suggest a percentage.
• Paying the same amount each quarter, based on last year's tax.
• Calculating each quarter from actual income so far. More accurate, more work.

A separate business checking account makes all three easier, since your deposits aren't mixed in with groceries and family transfers.

The forms you might see

Form 1099-K. Payment apps and card processors send this when payments cross reporting thresholds. After the 2025 law change, the IRS says third-party networks report when payments to you "exceed $20,000 and the number of transactions exceeds 200." Some states have lower thresholds. Not getting a form doesn't change what you owe. The IRS is clear: "Whether or not you receive a Form 1099-K, you must still report any income on your tax return."

Form 1099-NEC. If a studio pays you as a contractor, it may send one. If you pay another teacher as a contractor, you may need to send one. The reporting threshold is $2,000 for payments made after December 31, 2025, up from $600.

Schedule C and Schedule SE. Most sole proprietors report business income and expenses on Schedule C and figure self-employment tax on Schedule SE.

Records to keep, and for how long

The IRS's general rule is three years, with longer periods in some cases. Employment tax records are kept "for at least 4 years after the date that the tax becomes due or is paid, whichever is later," and property records (like a reformer you're depreciating) until the limitation period runs out for the year you sell or dispose of it. Some owners pick one longer period for everything, so they never have to sort by rule.

A records checklist, presented as options. Most owners keep some version of each:

• Income: session log or calendar export, invoices, payment app statements, bank deposits
• Packs: who bought what, when, and how many sessions remain
• Expenses: receipts (photos are fine for many purposes), card and bank statements
• Mileage: date, destination, purpose and miles for each trip
• Equipment: purchase receipts and dates, for depreciation
• Estimated payments: confirmation of each quarterly payment
• Contractors: W-9s and payment totals for anyone you paid

What to give your accountant

A short, organized handoff saves money, because accountants bill for time spent sorting. A typical year-end package:

1. Total income for the year, by month if possible
2. Expenses grouped by category (the table above is a good starting point)
3. Your mileage log with a total for each half of 2026, since the rate changed
4. Equipment bought this year, with dates and amounts
5. All 1099 forms you received
6. Estimated tax payments made, with dates
7. Prepaid sessions still outstanding at year-end, if you sell packs
8. Questions you have, written down

Questions to help you decide your setup

• Cash or accrual: which does your accountant recommend for a business your size, and why?
• Do you have a separate account for business deposits and expenses?
• How will you set aside money for quarterly taxes: percentage, fixed amount or calculated?
• How are you logging mileage now, and would it hold up with dates on every trip?
• Who will you ask when you're not sure: a CPA, an enrolled agent, or a bookkeeper?

Where software fits

Spreadsheets, accounting software and a shoebox of receipts all work if the habit is there. We built Wundaful inside a working classical studio in Santa Barbara, and the tax side was part of that: it keeps a mileage log and can export your year as a CSV or TXF file organized by Schedule C line, so the handoff to your accountant is one file instead of an afternoon. Your CPA should still review it.

Sources

1. Self-employment tax (Social Security and Medicare taxes): IRS, updated June 27, 2026.
2. Estimated taxes: IRS, updated September 25, 2026.
3. Publication 505 (2026), Tax Withholding and Estimated Tax: IRS, 2026.
4. Publication 334 (2025), Tax Guide for Small Business: IRS.
5. Standard mileage rates: IRS, updated July 28, 2026.
6. Topic no. 513, Work-related education expenses: IRS, updated September 24, 2026.
7. Simplified option for home office deduction: IRS, updated March 2, 2026.
8. Understanding your Form 1099-K: IRS, updated October 2026.
9. IRS issues FAQs on Form 1099-K threshold under the One, Big, Beautiful Bill: IRS, October 23, 2025.
10. Form 1099-NEC and independent contractors: IRS, updated October 16, 2026.
11. How long should I keep records?: IRS, updated June 30, 2026.
12. The Pilates Studio Owner's Bookkeeping Playbook: Beancount, June 3, 2026.