Retirement Planning Guide: 401k, Roth IRA, Social Security & Pension Calculators

Retirement planning is the intersection of long-term saving, tax optimization, and income strategy. Getting it right can mean hundreds of thousands of dollars more in after-tax lifetime wealth. This hub covers everything from contribution limits to withdrawal sequencing — with calculators to model every decision.

The Retirement Account Landscape

Tax-Deferred Accounts (Traditional 401k, IRA, SEP-IRA)

Contributions reduce your taxable income today. Investments grow tax-deferred. Withdrawals in retirement are taxed as ordinary income. Required Minimum Distributions (RMDs) begin at age 73.

Best for: People who expect to be in a lower tax bracket in retirement than today.

Tax-Free Accounts (Roth 401k, Roth IRA)

Contributions are made with after-tax dollars. Investments grow tax-free. Qualified withdrawals are completely tax-free with no RMDs.

Best for: People in lower tax brackets today, young investors with long time horizons, and those planning large Roth conversions.

Self-Employed Accounts (Solo 401k, SEP-IRA)

Self-employed individuals can contribute much more than employees — up to $69,000 in a Solo 401(k) via both employee and employer contributions. This is one of the most powerful tax reduction tools for freelancers and business owners.

Roth Conversion Strategy

Converting traditional IRA/401(k) funds to Roth during low-income years (early retirement, career breaks, or years with large deductions) can save hundreds of thousands in lifetime taxes. The key is filling your current tax bracket without pushing into the next one.

The Roth conversion ladder allows early retirees to access Roth funds penalty-free 5 years after conversion — a critical strategy for retiring before age 59½.

Social Security Optimization

The decision of when to claim Social Security is one of the most impactful financial choices in retirement:

• Claiming at 62: Permanent reduction of ~25–30% from your full benefit
• Claiming at Full Retirement Age (67 for most): 100% of your earned benefit
• Delaying to 70: Benefit increases 8% per year — a guaranteed return unmatched in any other asset

For married couples, coordinating spousal and survivor benefits adds additional complexity and opportunity.

Once benefits start, they rise each January with the cost-of-living adjustment (2.8% for 2026). The Social Security COLA calculator estimates your new check after the Medicare Part B premium and the hold-harmless rule.

Division 296 (Australia)

From July 1, 2025, Australians with superannuation balances above $3 million face an additional 15% tax on earnings attributable to the excess — bringing the effective rate to 30%. Proactive planning (pension rebalancing, downsizing strategies, withdrawal sequencing) can significantly reduce this liability.

Saver's Match (starting 2027)

For tax years beginning after 2026, the Saver's Credit becomes a Treasury matching contribution under 26 U.S.C. §6433 — up to $1,000 per eligible person (50% of the first $2,000 of qualified IRA or elective-deferral contributions), reduced by MAGI phase-outs and by certain distributions during a multi-year testing period. The deposit cannot go to a Roth IRA or a designated Roth account. Estimate 2027 amounts with the Saver's Match Calculator and read the Saver's Match guide.

Key Retirement Planning Strategies

1. Max out employer match first — this is a 50–100% instant return
2. Fill Roth during low-income years — conversions at 12% beat distributions at 22%
3. Delay Social Security if possible — delaying from 67 to 70 adds ~24% to your benefit permanently
4. Plan for RMDs early — large traditional IRAs trigger forced income that can push you into higher brackets
5. Sequence of returns matters — holding 1–2 years of expenses in cash protects against sequence risk in early retirement

Taxation of Retirement Income

Retirement doesn't end your tax obligations — it changes their shape. Many retirees are surprised to discover that Social Security benefits, IRA withdrawals, and pension income can all be taxable, and that the interaction between them can push them into higher brackets than expected.

Social Security taxation depends on your "provisional income" — adjusted gross income plus tax-exempt interest plus half of your Social Security benefits. If provisional income exceeds $25,000 (single) or $32,000 (married), up to 50% of benefits are taxable. Above $34,000/$44,000, up to 85% are taxable. The Taxable Social Security Calculator computes exactly how much of your benefit is included in income.

IRA withdrawals from traditional accounts are taxed as ordinary income in the year taken — at whatever your marginal rate is in retirement. Strategic Roth conversions in low-income years (before RMDs begin) can reduce lifetime taxes dramatically. Use the IRA Withdrawal Tax Calculator to model the after-tax impact of different withdrawal strategies.

If a Roth IRA contribution was not allowed for the year, returning it is a return of excess (plus allocated earnings or loss), not a normal Roth withdrawal. Estimate that worksheet with the Excess Roth IRA Contribution Calculator, and read how to fix an excess Roth IRA contribution for the deadline, recharacterizing, and what happens if you miss it.

Related Hubs

• Federal Income Tax Hub — Tax brackets, withholding, and how retirement income is taxed
• Capital Gains Tax Hub — Tax-efficient investing within retirement accounts
• Estate Planning Hub — Beneficiary designations, inherited IRAs, and wealth transfer
• Savings & Personal Finance Hub — Building wealth to fund retirement
• Business & Self-Employment Hub — Solo 401(k) and SEP-IRA for the self-employed
• Retirement Income Tax Hub — How SS benefits, IRA withdrawals, and pensions are taxed