Self-Employment Tax on Farm Income: How Farmers Pay Into Social Security and Medicare
Self-employment tax is the farmer’s version of FICA. An employee splits the Social Security and Medicare tax with the employer (each pays 7.65%), but a self-employed farmer pays both halves: 15.3% of net SE income up to the Social Security wage base ($168,600 for 2025), then 2.9% Medicare tax on the excess. On a $200,000 net farm profit, the SE tax is roughly $28,000. That is real money, and farmers have more planning tools to manage it than most self-employed taxpayers realize.
Net farm profit from Schedule F is subject to self-employment tax under IRC 1401. The farmer computes SE tax on Schedule SE, which starts with 92.35% of net farm profit (the 7.65% reduction mirrors the employer’s share that an employee would not pay tax on). Farmers have access to the optional method under Schedule SE, which allows a farmer with low or negative net income to report at least $6,040 of farm SE income to earn Social Security credits for the year (useful for building a benefit record in lean years). Farmers also get a special estimated tax rule: instead of quarterly payments, a farmer can make a single estimated payment by January 15 of the following year, or skip estimated payments entirely and file the return by March 1. An S-Corp election can reduce SE tax by splitting income into salary and distributions, but the salary must be reasonable and the QBI deduction interaction must be evaluated. Farm income averaging under IRC 1301 reduces income tax but does not reduce self-employment tax.
How is self-employment tax calculated on farm income?
The calculation starts with net farm profit from Schedule F (line 34). This amount flows to Schedule SE, Section A or Section B.
Step 1: Multiply net farm profit by 92.35% (0.9235). This adjustment accounts for the fact that an employee does not pay FICA on the employer’s share of FICA. For a farmer with $200,000 net profit, the SE income is $200,000 x 0.9235 = $184,700.
Step 2: Apply the Social Security tax rate (12.4%) on income up to the wage base ($168,600 for 2025). The Medicare tax rate (2.9%) applies to all SE income with no cap. On $184,700: Social Security tax = $168,600 x 12.4% = $20,906. Medicare tax = $184,700 x 2.9% = $5,356. Total SE tax = $26,262.
Step 3: Deduct 50% of the SE tax as an above-the-line deduction on Form 1040 (Schedule 1, line 15). This deduction reduces income tax but not SE tax.
If net SE income exceeds $200,000 ($250,000 MFJ), the Additional Medicare Tax of 0.9% applies under IRC 3101(b)(2).
What’s the optional method for farmers?
The optional method (Schedule SE, Section B) allows a farmer with gross farm income of $9,060 or less, or net farm profit of less than $6,540, to report SE income of two-thirds of gross farm income (up to $6,040). This ensures the farmer earns at least one Social Security credit quarter (or up to four quarters) even in a year when the farm breaks even or loses money.
This is valuable because Social Security benefits are based on a 35-year earnings history. A farmer who has several lean years with zero or negative net income would have gaps in the earnings record, reducing future Social Security benefits. The optional method fills those gaps.
The optional method can be used in any year when farm income is low enough to qualify, but can only be used for a maximum of five years (not necessarily consecutive) where the farmer would otherwise have had no SE income. After five uses, the optional method is no longer available for years with no actual net income.
What are the special estimated tax rules for farmers?
Most self-employed taxpayers must pay estimated taxes in four quarterly installments (April 15, June 15, September 15, January 15). Farmers get two special options:
Option 1: Single payment by January 15. A farmer whose gross income from farming is at least two-thirds of total gross income can make a single estimated tax payment by January 15 of the following year (instead of four quarterly payments). No penalty applies if the single payment covers the required estimated tax.
Option 2: File by March 1 and skip estimated payments entirely. If the farmer files the return and pays the full tax by March 1, no estimated tax payments are required at all, and no underpayment penalty applies. This is the simplest approach for farmers who can prepare their returns quickly after year-end.
These special rules exist because farm income is seasonal and unpredictable. A farmer may not know the year’s total income until the harvest is sold, which can be as late as December. Requiring quarterly estimates on income that is not yet known would be impractical.
The two-thirds gross income test is applied annually. If farm income drops below two-thirds of total gross income (because the farmer has significant non-farm income), the special estimated tax rules do not apply for that year, and the farmer must make quarterly payments.
How does the S-Corp election affect farm SE tax?
An S-Corp election splits farm income into two streams: the owner’s salary (subject to payroll tax) and the remaining profit distributed to the owner (not subject to payroll tax). The savings can be substantial for profitable farms.
The owner-operator must pay themselves a reasonable salary. For a full-time farmer, this means a salary comparable to what a hired farm manager would earn in the same area for the same type of operation. The IRS has challenged S-Corp salaries that are unreasonably low.
The SE tax savings must be weighed against the additional compliance costs (S-Corp return, payroll processing, W-2 preparation) and the impact on the QBI deduction. The QBI deduction for a farm is limited by the greater of 50% of W-2 wages or 25% of W-2 wages plus 2.5% of UBIA. Paying a higher salary increases the W-2 wage component, which can increase the QBI deduction limit, partially offsetting the benefit of keeping the salary low for SE tax purposes.
Does farm income averaging reduce self-employment tax?
No. Farm income averaging under IRC 1301 reduces income tax by spreading the current year’s farm income over the three prior base years, allowing the farmer to be taxed at the lower marginal rates that applied in those years. But the SE tax is calculated on the current year’s actual net farm income, without regard to income averaging. The SE tax base does not change.
This means a farmer who has a windfall year (a large crop sale, a government payment, an insurance settlement) pays full SE tax on the windfall, even though income averaging reduces the income tax. The SE tax hit in the windfall year can be a surprise if the farmer was planning on income averaging to reduce the total tax bill.
What about FICA for farm employees?
A farmer who hires employees must withhold and pay FICA on wages, with a special threshold. For 2025, a farm employer must withhold FICA if the employee earns $150 or more in cash wages during the year, or if the employer’s total payroll for agricultural labor exceeds $2,500 for the year. If neither threshold is met, the wages are exempt from FICA (though they may still be subject to income tax withholding if the employee requests it).
Farm employers report agricultural wages on Form 943 (Employer’s Annual Federal Tax Return for Agricultural Employees) rather than the standard Form 941 (filed quarterly). Form 943 is filed annually.
For crew leaders who furnish workers for agricultural labor, the crew leader is generally treated as the employer for FICA purposes (and thus responsible for withholding and paying the tax) unless the farm operator has a direct employment relationship with the workers.
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- Agriculture Farm Retirement Plans Owner Operator
- Agriculture Farm Tax Deductions Expenses
- Agriculture Livestock Tax Treatment Raised Purchased
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Yarik Yarosh, CPA. "Self-Employment Tax on Farm Income: How Farmers Pay Into Social Security and Medicare." Blue Cloud CPA, September 4, 2026. https://bluecloudcpa.com/guides/agriculture-self-employment-tax-farm-income
This guide is general information, not tax advice for your specific situation. Which points apply, and how, depends on your facts.