See exactly how much tax you save by contributing to a 401(k), IRA, SEP-IRA, Solo 401(k), or HSA in 2026. Includes 2026 contribution limits and phase-out rules.
2026 limits: 401(k) $23,500 ($31,000 age 50+) · Traditional/Roth IRA $7,000 ($8,000 age 50+) · SEP-IRA $70,000 or 25% net SE income · Solo 401(k) $70,000 ($77,500 age 50+) · SIMPLE IRA $16,500 ($20,000 age 50+) · HSA self $4,300 / family $8,550. Roth IRA phase-out: single $150K–$165K, MFJ $236K–$246K. Traditional IRA deductibility phase-out (with workplace plan): single $79K–$89K, MFJ $126K–$146K.
Pre-tax retirement contributions reduce your taxable income in the year you make them. When you contribute $10,000 to a traditional 401(k), your W-2 Box 1 income is reduced by $10,000. At the 22% federal bracket, that $10,000 saves you $2,200 in federal income tax — plus state income tax savings and, for self-employed individuals, SE tax savings. The money is not gone; it grows tax-deferred in the retirement account. Taxes are due when you withdraw in retirement, ideally at a lower tax rate.
For self-employed individuals, retirement contributions have an additional advantage: SEP-IRA and Solo 401(k) contributions reduce self-employment income, cutting both the 15.3% SE tax and income tax simultaneously. A self-employed person at the 22% bracket who contributes $10,000 to a SEP-IRA saves approximately $2,200 in federal income tax plus $1,413 in SE tax (15.3% × 92.35% net earnings multiplier) for a combined savings of $3,613 — a 36.1% effective benefit on the contribution.
HSAs offer the most powerful tax treatment of any account: contributions are deductible, investment growth is tax-free, and withdrawals for qualified medical expenses are tax-free. This triple tax benefit means a $4,300 HSA contribution at the 22% bracket saves $946 in federal taxes today, grows without tax on gains, and is never taxed if spent on healthcare. Investing HSA funds in index funds and paying current medical expenses out-of-pocket is a powerful long-term wealth strategy.
Sarah is a self-employed management consultant with $120,000 net SE income. She is a single filer in Colorado (4.4% state rate), age 45. She maximizes her Solo 401(k) and HSA contributions.
Sarah invests nearly $50,000 for retirement but her out-of-pocket cost is only $28,674 — the government subsidizes $21,249 of her contribution through tax savings. Every dollar she contributes to pre-tax accounts effectively costs her about 57 cents. For self-employed individuals with fluctuating income, maximizing these contributions in high-income years is one of the most powerful tax strategies available.
Solo 401(k) vs. SEP-IRA for self-employed
For self-employed individuals, a Solo 401(k) typically allows higher contributions than a SEP-IRA at lower income levels. Below approximately $140,000 in net SE income, the Solo 401(k)'s employee elective deferral ($23,500) plus employer contribution beats the SEP-IRA's 25%-only formula. Above that threshold they converge. Solo 401(k)s also allow Roth contributions and loans, while SEP-IRAs do not. The main SEP-IRA advantage is simplicity — it requires minimal paperwork and can be opened and funded up to the tax filing deadline including extensions.
IRA phase-outs and the backdoor Roth
High earners who exceed the Roth IRA income limit ($165,000 single / $246,000 MFJ in 2026) cannot contribute directly to a Roth IRA. The backdoor Roth strategy involves contributing to a non-deductible traditional IRA (no income limit) and then converting it to a Roth IRA. The conversion is taxable only on any earnings between contribution and conversion (typically minimal if done quickly). If you have no pre-existing traditional IRA funds, the backdoor Roth is a clean strategy — if you have existing pre-tax IRA funds, the pro-rata rule may make it less efficient.
Contribution timing and deadline rules
401(k) employee elective deferrals must be made by December 31 of the tax year. IRA and HSA contributions for 2026 can be made up to the April 15, 2027 tax filing deadline — allowing you to calculate your exact tax situation before deciding how much to contribute. SEP-IRA contributions can be made until the tax filing deadline including extensions (up to October 15, 2027 with extension). Solo 401(k) plans must be established by December 31 of the contribution year, even though contributions can be made later.
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The 2026 401(k) employee contribution limit is $23,500. If you are age 50 or older, you can make catch-up contributions of an additional $7,500, bringing your total to $31,000. The overall 401(k) limit (including employer contributions) is $70,000 in 2026. Pre-tax 401(k) contributions reduce your adjusted gross income dollar-for-dollar, saving federal income tax, state income tax, and — for self-employed solo 401(k) contributors — self-employment tax. Roth 401(k) contributions are made after tax and grow tax-free, but do not reduce current-year taxable income.
The IRA contribution limit for 2026 is $7,000 ($8,000 if age 50 or older). This limit applies to the combined total of all your traditional and Roth IRA contributions — you cannot contribute $7,000 to a traditional IRA and another $7,000 to a Roth IRA in the same year. Traditional IRA deductibility phases out for those covered by a workplace retirement plan: single filers phase out between $79,000–$89,000 AGI; married filing jointly phases out at $126,000–$146,000. Roth IRA eligibility phases out at $150,000–$165,000 (single) and $236,000–$246,000 (MFJ).
A Simplified Employee Pension (SEP-IRA) is a retirement account for self-employed individuals and small business owners. The 2026 SEP-IRA contribution limit is the lesser of $70,000 or 25% of net self-employment income (after the SE tax deduction). A sole proprietor earning $100,000 net can contribute up to $18,587 (25% of net self-employment income after the SE deduction). SEP-IRA contributions are fully deductible from self-employment income, reducing both income tax and SE tax. SEP-IRAs are easy to open and have no annual filing requirements, making them popular for freelancers and contractors.
Health Savings Account (HSA) contributions for 2026 are $4,300 for self-only coverage and $8,550 for family coverage. Those age 55 or older can contribute an additional $1,000 catch-up contribution. HSAs offer a triple tax benefit: contributions are tax-deductible, growth is tax-free, and withdrawals for qualified medical expenses are tax-free. This makes the HSA the most tax-advantaged account available. To contribute to an HSA, you must be enrolled in a High Deductible Health Plan (HDHP). After age 65, HSA funds can be used for any purpose (not just medical) and are taxed as ordinary income — functioning like a traditional IRA.
The traditional vs. Roth decision depends primarily on whether you expect your tax rate to be higher now or in retirement. Pre-tax contributions save taxes now at your current marginal rate. Roth contributions save taxes in retirement at your future rate. If you are in a high bracket now (32%+) and expect to drop to a lower bracket in retirement, pre-tax is usually better. If you are in a lower bracket now (12% or 22%) and expect rates to rise, Roth is usually better. Young earners early in their career often benefit most from Roth contributions. High earners close to retirement often benefit more from traditional contributions. Many advisors recommend diversifying across both account types for tax flexibility in retirement.