If you mow lawns for money, you have to pay taxes once your net profit for the year hits $400, and that rule applies whether customers pay you in cash, through a payment app, or by check. The IRS treats mowing income the same as any other self-employment income, which means self-employment tax kicks in at that $400 line and federal income tax may apply on top depending on the rest of your income.1Internal Revenue Service. Topic No. 554, Self-Employment Tax Not receiving a 1099 does not change the obligation.
What Counts Toward the $400
The $400 is net profit, not what customers hand you. Subtract your business expenses from the total you collected; if what’s left is $400 or more, you owe self-employment tax and have to file a federal return. If you collected $1,200 over the summer and spent $850 on gas, blades, and supplies, your net profit is $350 and you’re under the line.
A few things people assume matter but don’t. Whether a customer gives you a Form 1099-NEC doesn’t change anything.2Internal Revenue Service. Form 1099-NEC (Rev. April 2025) – Instructions for Recipient Whether Venmo, PayPal, or Cash App sends you a 1099-K doesn’t either. The 1099-K reporting threshold recently reverted to $20,000 and 200 transactions, so almost no lawn mower will ever see one.3Internal Revenue Service. IRS Issues FAQs on Form 1099-K Threshold Under the One, Big, Beautiful Bill The reporting obligation is yours regardless of what paperwork lands in your mailbox.
If your net profit comes in at $399, self-employment tax doesn’t apply. Regular federal income tax could still come into play depending on your other income, but for most people mowing on the side, the $400 line is the trigger that matters.
The Taxes That Actually Apply
Self-employment tax is the biggest bite. The rate is 15.3% of net earnings, made up of 12.4% for Social Security and 2.9% for Medicare.4Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes) When you work for someone else, you and the employer split those taxes. When you’re mowing on your own, you pay both halves. On $5,000 of net profit, that’s roughly $765.
The Social Security portion applies to net earnings up to $184,500 in 2026, a ceiling no lawn mowing business will approach.5Social Security Administration. Contribution and Benefit Base The Medicare portion has no ceiling. One built-in break: you can deduct half of your self-employment tax when figuring your adjusted gross income.1Internal Revenue Service. Topic No. 554, Self-Employment Tax That doesn’t reduce the self-employment tax itself, but it lowers the income figure used for regular income tax.
Federal income tax sits on top. Whether you actually owe any depends on your total income against your standard deduction. For 2026, the standard deduction is $16,100 for single filers, $32,200 for married couples filing jointly, and $24,150 for heads of household.6Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 A single filer whose only income is $4,000 in mowing profit owes the self-employment tax but almost certainly no income tax. Someone with a full-time job who earns $4,000 mowing on weekends will owe both, because the profit stacks on top of wages.
Sole proprietors can also claim the qualified business income deduction, worth up to 20% of net business income against taxable income.7Internal Revenue Service. Qualified Business Income Deduction It reduces income tax only, not self-employment tax.
Deductions That Lower the Bill
Every legitimate business expense reduces net profit, which reduces both taxes. Most lawn care operators have more deductions available than they use.
- Mileage to and from customer properties. The 2026 standard mileage rate is 72.5 cents per mile, so 2,000 miles across a season is a $1,450 deduction. You can use the standard rate or track actual vehicle costs (gas, oil, repairs, insurance), but not both.8Internal Revenue Service. IRS Sets 2026 Business Standard Mileage Rate
- Consumables like mower blades, trimmer line, gas, oil, and trash bags, deductible in the year purchased.9Internal Revenue Service. 2025 Instructions for Schedule C (Form 1040) – Profit or Loss From Business
- Big equipment. A new mower or trailer can be depreciated over its useful life or, in most cases, written off in the year of purchase under the Section 179 election. The 2026 Section 179 limit is $2,560,000, far more than any residential operator will spend, so in practice a new mower can be deducted in full the year you buy it.
- A home office used exclusively for scheduling, invoicing, and managing the business. The simplified method allows $5 per square foot up to 300 square feet, for a $1,500 maximum.10Internal Revenue Service. Simplified Option for Home Office Deduction
- Advertising costs: flyers, business cards, a basic website, yard signs.
All of these go on Schedule C (Form 1040), which subtracts expenses from revenue to arrive at your net profit.9Internal Revenue Service. 2025 Instructions for Schedule C (Form 1040) – Profit or Loss From Business That figure flows to Schedule SE for the self-employment tax and to Schedule 1 for income tax.
Quarterly Estimated Payments
If you expect to owe $1,000 or more in combined income and self-employment tax for the year, the IRS wants payments quarterly rather than a single lump in April.11Internal Revenue Service. Estimated Taxes This surprises a lot of first-year operators.
The four deadlines:
- April 15, covering income earned January through March
- June 15, covering April through May
- September 15, covering June through August
- January 15 of the following year, covering September through December
Payments go in through Form 1040-ES or IRS Direct Pay.12Internal Revenue Service. Estimated Tax Since mowing income is seasonal, the payments don’t have to be equal; pay more during busy months and less in the off-season.
You can generally avoid the underpayment penalty by paying at least 90% of the current year’s tax or 100% of the prior year’s, whichever is less.13Internal Revenue Service. Underpayment of Estimated Tax by Individuals Penalty The prior-year figure becomes 110% if your AGI topped $150,000. In your first year mowing, with no prior-year liability, the 90% target is the one to hit.
Records When Customers Pay Cash
The IRS doesn’t require any particular system, but your records have to clearly show income and expenses.14Internal Revenue Service. Publication 583 Starting a Business and Keeping Records For cash-heavy work, that means building the paper trail yourself.
Keep a log with the date, customer name, service, and amount for every job. When cash gets deposited to a bank account, note on the deposit slip that the source is business income. Save receipts for gas, supplies, and equipment. When you pay cash and can’t get a receipt, write down what you bought, when, why, and how much, as close to the time of purchase as possible.14Internal Revenue Service. Publication 583 Starting a Business and Keeping Records Most small operators who run into audit trouble aren’t hiding income; they simply never wrote anything down and can’t reconstruct the numbers. A spreadsheet updated weekly solves the problem.
How to File
Reporting lawn care income takes three forms alongside your Form 1040:
- Schedule C, which reports gross income and expenses and produces your net profit.
- Schedule SE, which calculates self-employment tax on that net profit.4Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes)
- Schedule 1, which brings the profit onto your main return and records the deduction for half your self-employment tax.
IRS Free File offers free tax prep software to filers with an adjusted gross income of $89,000 or less.15Internal Revenue Service. 2026 Tax Filing Season Opens With Several Free Filing Options Available Commercial tax software handles Schedule C and Schedule SE without extra work on your part. Paper filing is allowed but slower; e-filed returns are acknowledged in about 24 hours, while paper can take weeks to show up in IRS systems.16Internal Revenue Service. How Taxpayers Can Check the Status of Their Federal Tax Refund If you owe, pay by IRS Direct Pay, debit or credit card, or a mailed check with a voucher.
Teens and Dependents
Being claimed as a dependent doesn’t get a teenager out of this. If a minor’s net mowing profit hits $400, they file their own return and pay the 15.3% self-employment tax like anyone else.17Internal Revenue Service. Publication 501 (2025), Dependents, Standard Deduction, and Filing Information The dependent’s standard deduction still applies to income tax, so a teen with only lawn care income will usually owe self-employment tax but no federal income tax. At $500 in net profit the self-employment tax runs about $77. Small, but ignoring it leaves the teen a non-filer. Filing early also starts building Social Security credits.
State and Local Rules Still Apply
Federal isn’t the whole picture. Most states charge their own income tax on self-employment profits. The nine without an individual income tax are Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, and Wyoming. Everywhere else, expect a state return in addition to the federal one.
Many cities and counties also require a business license or permit even for small lawn care operations, with fees that vary from a flat annual charge to a rate based on projected gross receipts. Check your local government before your first season; fines for skipping a license can easily outrun your tax bill.
What Happens if You Skip It
Not filing is the costliest option. The failure-to-file penalty is 5% of the unpaid tax per month, up to a 25% maximum.18Internal Revenue Service. Failure to File Penalty If a return is more than 60 days late, the minimum penalty is $525 or 100% of the tax owed, whichever is less.19Internal Revenue Service. Topic No. 653, IRS Notices and Bills, Penalties and Interest Charges A separate failure-to-pay penalty of 0.5% per month applies if you file on time but don’t pay. Interest runs on top of both. File by the deadline even if you can’t pay the full amount; the filing penalty is ten times the payment penalty.