Reference
Quick-reference for tax brackets, contribution limits, formulas, deadlines, and checklists. Bookmark this page. Numbers are for the 2025 tax year unless noted (this tutorial was last reviewed 2026-05-10). The IRS updates these annually, so double-check current-year figures at irs.gov before making decisions.
Federal Income Tax Brackets (2025)
Single Filers
| Taxable Income | Tax Rate |
|---|---|
| $0 - $11,925 | 10% |
| $11,926 - $48,475 | 12% |
| $48,476 - $103,350 | 22% |
| $103,351 - $197,300 | 24% |
| $197,301 - $250,525 | 32% |
| $250,526 - $626,350 | 35% |
| Over $626,350 | 37% |
Married Filing Jointly
| Taxable Income | Tax Rate |
|---|---|
| $0 - $23,850 | 10% |
| $23,851 - $96,950 | 12% |
| $96,951 - $206,700 | 22% |
| $206,701 - $394,600 | 24% |
| $394,601 - $501,050 | 32% |
| $501,051 - $751,600 | 35% |
| Over $751,600 | 37% |
How Marginal Brackets Work
Brackets apply only to income within that range. Example for a single filer earning $80,000:
$0 - $11,925 × 10% = $1,192.50
$11,926 - $48,475 × 12% = $4,385.88
$48,476 - $80,000 × 22% = $6,935.28
----------
Total Federal Tax: $12,513.66
Effective Rate: 15.6%
Your marginal rate (22%) is not your effective rate (15.6%). Never turn down a raise because "it'll put me in a higher bracket": only the dollars above the threshold are taxed at the higher rate.
Standard Deduction (2025)
| Filing Status | Amount |
|---|---|
| Single | $15,000 |
| Married filing jointly | $30,000 |
| Head of household | $22,500 |
| Additional (age 65+ or blind, single) | +$2,000 |
| Additional (age 65+ or blind, married) | +$1,600 |
Capital Gains Tax Rates (2025)
| Taxable Income (Single) | Long-Term Rate |
|---|---|
| $0 - $48,350 | 0% |
| $48,351 - $533,400 | 15% |
| Over $533,400 | 20% |
Short-term capital gains (held less than 1 year) are taxed as ordinary income.
Retirement Account Contribution Limits (2025)
| Account | Under 50 | Age 50+ Catch-Up | Total 50+ |
|---|---|---|---|
| 401k / 403b / 457b | $23,500 | +$7,500 | $31,000 |
| Traditional IRA | $7,000 | +$1,000 | $8,000 |
| Roth IRA | $7,000 | +$1,000 | $8,000 |
| SIMPLE IRA | $16,500 | +$3,500 | $20,000 |
| SEP IRA | $70,000 or 25% of comp | N/A | $70,000 |
| Solo 401k (employee) | $23,500 | +$7,500 | $31,000 |
| Solo 401k (total employee + employer) | $70,000 | +$7,500 | $77,500 |
Roth IRA Income Limits (2025)
| Filing Status | Full Contribution | Phase-Out | No Contribution |
|---|---|---|---|
| Single | MAGI < $150,000 | $150,000 - $165,000 | > $165,000 |
| Married filing jointly | MAGI < $236,000 | $236,000 - $246,000 | > $246,000 |
Backdoor Roth: If over the income limit, contribute to a Traditional IRA (non-deductible) then convert to Roth. Legal, common, IRS-acknowledged.
Traditional IRA Deduction Phase-Outs (2025, Covered by Employer Plan)
| Filing Status | Full Deduction | Phase-Out | No Deduction |
|---|---|---|---|
| Single | MAGI < $79,000 | $79,000 - $89,000 | > $89,000 |
| Married filing jointly | MAGI < $126,000 | $126,000 - $146,000 | > $146,000 |
HSA Contribution Limits (2025)
| Coverage | Limit | Age 55+ Catch-Up |
|---|---|---|
| Self-only | $4,300 | +$1,000 |
| Family | $8,550 | +$1,000 |
HSA triple tax advantage: Tax-deductible contributions, tax-free growth, tax-free withdrawals for qualified medical expenses. After age 65, non-medical withdrawals taxed as income (like a Traditional IRA).
Other Contribution Limits (2025)
| Account | Limit |
|---|---|
| 529 plan (gift tax exclusion) | $19,000/year per beneficiary (no income limit) |
| 529 superfunding (5-year election) | $95,000 lump sum |
| FSA (healthcare) | $3,300 |
| Dependent Care FSA | $5,000 |
| I-Bond annual purchase limit | $10,000 per SSN (electronic) |
| Gift tax exclusion | $19,000 per recipient per year |
| Estate tax exemption | $13,990,000 |
Social Security (2025)
| Item | Amount |
|---|---|
| Full retirement age (born 1960+) | 67 |
| Early retirement (reduced benefits) | 62 |
| Delayed retirement credit (per year past FRA, up to 70) | +8% |
| Maximum benefit at FRA | ~$4,018/month |
| Maximum benefit at 70 | ~$5,108/month |
| Earnings subject to SS tax | $176,100 |
| SS tax rate (employee) | 6.2% |
| Medicare tax rate (employee) | 1.45% (+ 0.9% above $200k) |
Claiming strategy: Every year you delay past 62 increases your benefit by roughly 6-8%. If you're healthy and can afford to wait, delay to 70 for maximum lifetime benefits.
Important Financial Deadlines
Annual Deadlines
| Date | Deadline |
|---|---|
| January 1 | New contribution limits take effect, FSA grace period starts (if applicable) |
| January 31 | Employers issue W-2s and 1099s |
| March 15 | S-Corp and partnership tax returns due (or extension) |
| April 1 | Required Minimum Distribution (RMD) deadline for the year you turn 73 (first year only) |
| April 15 | Federal tax filing deadline, IRA/Roth IRA/HSA contribution deadline for prior year, Q1 estimated tax payment |
| June 15 | Q2 estimated tax payment |
| September 15 | Q3 estimated tax payment, extended S-Corp/partnership returns due |
| October 15 | Extended individual tax returns due |
| November 1 | ACA marketplace open enrollment begins (typically) |
| December 15 | ACA marketplace enrollment deadline for January coverage (typically) |
| December 31 | 401k/403b contribution deadline, Roth conversion deadline, tax-loss harvesting deadline, RMD deadline, charitable contribution deadline, FSA spending deadline (unless grace period) |
Quarterly Estimated Tax Payments (2025)
| Quarter | Income Period | Payment Due |
|---|---|---|
| Q1 | Jan 1 - Mar 31 | April 15 |
| Q2 | Apr 1 - May 31 | June 15 |
| Q3 | Jun 1 - Aug 31 | September 15 |
| Q4 | Sep 1 - Dec 31 | January 15 (next year) |
Who must pay: Self-employed, freelancers, and anyone who expects to owe $1,000+ in taxes beyond withholding. Penalty for underpayment if you don't pay as you go.
Useful Financial Formulas
Compound Interest
A = P × (1 + r/n)^(n×t)
A = Final amount
P = Principal (starting amount)
r = Annual interest rate (decimal)
n = Compounding frequency per year
t = Years
Example: $10,000 at 7% for 30 years, compounded monthly
A = 10,000 × (1 + 0.07/12)^(12×30)
A = 10,000 × (1.00583)^360
A = 10,000 × 8.1165
A = $81,165
Future Value of Monthly Contributions
FV = PMT × [((1 + r/n)^(n×t) - 1) / (r/n)]
PMT = Monthly contribution
r = Annual return rate (decimal)
n = 12 (monthly)
t = Years
Example: $500/month at 7% for 30 years
FV = 500 × [((1 + 0.07/12)^(360) - 1) / (0.07/12)]
FV = 500 × [(8.1165 - 1) / 0.00583]
FV = 500 × 1,220.38
FV = $610,191
$500/month × 30 years = $180,000 contributed. Growth = $430,191. That's compound interest at work.
Rule of 72
Years to double = 72 ÷ Annual Return Rate
Examples:
7% return: 72 ÷ 7 = 10.3 years to double
10% return: 72 ÷ 10 = 7.2 years to double
3% return: 72 ÷ 3 = 24 years to double
20% debt: 72 ÷ 20 = 3.6 years to double (what credit card debt does to you)
Monthly Mortgage Payment
M = P × [r(1+r)^n] / [(1+r)^n - 1]
M = Monthly payment
P = Loan principal
r = Monthly interest rate (annual ÷ 12)
n = Total number of payments (years × 12)
Example: $300,000 loan at 6.5% for 30 years
r = 0.065/12 = 0.005417
n = 360
M = 300,000 × [0.005417(1.005417)^360] / [(1.005417)^360 - 1]
M = 300,000 × [0.005417 × 6.9913] / [6.9913 - 1]
M = 300,000 × 0.03787 / 5.9913
M = 300,000 × 0.006321
M = $1,896/month (principal + interest only, no taxes/insurance)
Debt Payoff Timeline
Months to pay off = -log(1 - (Balance × r / Payment)) / log(1 + r)
r = Monthly interest rate (APR ÷ 12)
Example: $5,000 balance, 22% APR, $200/month payment
r = 0.22/12 = 0.01833
Months = -log(1 - (5000 × 0.01833 / 200)) / log(1 + 0.01833)
Months = -log(1 - 0.4583) / log(1.01833)
Months = -log(0.5417) / 0.00817
Months = 0.2661 / 0.00817
Months = 32.6 months (~2.7 years)
Total paid: $6,520 | Interest cost: $1,520
4% Rule (Retirement Withdrawal)
Annual safe withdrawal = Portfolio × 0.04
Required portfolio = Annual expenses × 25
Example: Need $60,000/year in retirement
Required portfolio: $60,000 × 25 = $1,500,000
Based on the Trinity Study. 4% withdrawal rate historically survives 30-year retirements 95%+ of the time. Conservative alternative: 3.5%.
Key Financial Ratios
Track these numbers about yourself:
| Ratio | Formula | Healthy Target | Danger Zone |
|---|---|---|---|
| Savings rate | (Total savings + investments) ÷ Gross income | 20%+ | Below 10% |
| Debt-to-income (DTI) | Monthly debt payments ÷ Gross monthly income | Below 36% | Above 43% |
| Housing cost ratio | (Mortgage/rent + insurance + taxes) ÷ Gross monthly income | Below 28% | Above 36% |
| Emergency fund ratio | Liquid savings ÷ Monthly expenses | 3-6 months | Below 1 month |
| Investment expense ratio | Total investment fees ÷ Total invested | Below 0.20% | Above 1% |
| Retirement savings rate | Annual retirement contributions ÷ Gross income | 15%+ | Below 5% |
| Liquid net worth ratio | (Assets − home equity − liabilities) ÷ Annual expenses | 1x+ | Negative |
Example Ratio Check
Gross Income: $90,000/year ($7,500/month)
Take-Home: $6,200/month
Savings Rate: $1,500/month ÷ $7,500 = 20% ✓
DTI: $1,950/month ÷ $7,500 = 26% ✓
Housing Ratio: $1,800/month ÷ $7,500 = 24% ✓
Emergency Fund: $18,000 ÷ $4,500/month = 4.0 ✓
Retirement Rate: $12,000/year ÷ $90,000 = 13.3% ⚠ (target 15%)
Annual Financial Review Checklist
Do this every December or January. Block 2-3 hours.
Income and Taxes
- [ ] Review total income for the year
- [ ] Verify W-4 withholding is correct (refund too large = interest-free loan to IRS)
- [ ] Maximize 401k/IRA contributions before year-end deadline
- [ ] Harvest tax losses in taxable accounts if applicable
- [ ] Make any final charitable contributions
- [ ] Review estimated tax payments if self-employed
Budget and Spending
- [ ] Review actual spending vs. budget for the year
- [ ] Identify and cancel unused subscriptions
- [ ] Review recurring bills for rate increases
- [ ] Set budget for the new year
- [ ] Negotiate bills (insurance, phone, internet, subscriptions)
Savings and Investments
- [ ] Calculate net worth and compare to last year
- [ ] Review retirement account balances and contributions
- [ ] Check asset allocation, rebalance if off target
- [ ] Review investment fees, switch to lower-cost funds if available
- [ ] Confirm you're getting full employer 401k match
- [ ] Review savings goals progress
Insurance
- [ ] Review health insurance during open enrollment
- [ ] Review life insurance coverage (10-12x income)
- [ ] Shop auto and home/renters insurance for better rates
- [ ] Check disability insurance coverage
- [ ] Review umbrella policy if net worth > $500k
Credit and Debt
- [ ] Pull free credit report (annualcreditreport.com)
- [ ] Review credit score
- [ ] Check for errors or fraudulent accounts
- [ ] Review debt payoff progress
- [ ] Consider refinancing if rates have dropped
Estate and Legal
- [ ] Review and update beneficiaries on all accounts
- [ ] Review will, trust, power of attorney (update if life changed)
- [ ] Verify life insurance beneficiaries match your wishes
- [ ] Confirm guardian designations for minor children are current
Accounts and Access
- [ ] Update passwords on financial accounts
- [ ] Verify two-factor authentication is enabled everywhere
- [ ] Ensure spouse/partner knows where all accounts are
- [ ] Update your financial account inventory document
Glossary
| Term | Definition |
|---|---|
| APR | Annual Percentage Rate: the yearly cost of borrowing, including fees |
| APY | Annual Percentage Yield: the yearly return on savings, including compounding |
| Asset allocation | How investments are divided across stocks, bonds, and other categories |
| Beneficiary | Person or entity designated to receive assets from an account or policy |
| Capital gains | Profit from selling an investment; short-term (< 1 year) taxed as income, long-term taxed at lower rates |
| Compound interest | Interest earned on both principal and previously earned interest |
| CPA | Certified Public Accountant: licensed tax and accounting professional |
| CFP | Certified Financial Planner: fiduciary financial planning credential |
| DTI | Debt-to-income ratio: monthly debt payments divided by gross monthly income |
| Emergency fund | Liquid savings covering 3-6 months of expenses for unexpected costs or income loss |
| Escrow | Account held by a third party (often mortgage servicer) for property taxes and insurance |
| Fiduciary | Legally required to act in your best interest (not all advisors are fiduciaries) |
| FICO score | Credit score model ranging from 300-850 used by most lenders |
| HYSA | High-Yield Savings Account: online savings paying significantly more than traditional banks |
| Index fund | Fund that tracks a market index (S&P 500, total market) with minimal fees |
| IRA | Individual Retirement Account: tax-advantaged account for retirement savings |
| Liquidity | How quickly an asset can be converted to cash without significant loss |
| MAGI | Modified Adjusted Gross Income: used to determine eligibility for tax benefits |
| Marginal tax rate | Tax rate on the next dollar earned (your highest bracket) |
| Effective tax rate | Total tax paid divided by total income (always lower than marginal rate) |
| Net worth | Total assets minus total liabilities |
| POD/TOD | Payable/Transfer on Death: beneficiary designation that bypasses probate |
| Probate | Legal process of settling a deceased person's estate through the courts |
| QDRO | Qualified Domestic Relations Order: court order splitting retirement accounts in divorce |
| Rebalancing | Adjusting portfolio back to target asset allocation |
| RMD | Required Minimum Distribution: mandatory annual withdrawals from retirement accounts starting at 73 |
| Roth | After-tax contributions, tax-free growth and withdrawals in retirement |
| Sinking fund | Savings set aside monthly for a known future expense |
| Tax-loss harvesting | Selling investments at a loss to offset capital gains and reduce taxes |
| Traditional | Pre-tax contributions, taxed as income when withdrawn in retirement |
| Umbrella policy | Extra liability insurance beyond home and auto limits |
| Vesting | Schedule determining when employer contributions (401k match, RSUs) become fully yours |
| W-4 | IRS form that determines how much tax your employer withholds from your paycheck |
Key Takeaways
- Know the brackets: your marginal rate is not your effective rate
- Max out contribution limits: every dollar in a tax-advantaged account saves you taxes
- Use the deadlines: April 15 for IRA/HSA, December 31 for 401k and conversions
- Run the formulas: compound interest and the Rule of 72 make the case for starting early
- Track your ratios: savings rate, DTI, and housing ratio reveal your financial health at a glance
- Do the annual review: 2-3 hours once a year catches problems before they compound
- Bookmark this page: reference it whenever you need a number, a formula, or a checklist
Where to Go From Here
The basics covered in this tutorial are the foundation. Once they are in place, the next layer is investing and building wealth on top of the system you just put together.
- /investing: asset allocation, index funds, tax-advantaged accounts, withdrawal strategy
- IRS publications at irs.gov: authoritative for tax brackets, deduction limits, and contribution caps
- The Bogleheads wiki (bogleheads.org/wiki): low-cost, evidence-based investing reference
- The CFPB at consumerfinance.gov: credit reports, complaints, lender disputes
- AnnualCreditReport.com: free weekly credit reports from all three bureaus
- For a deeper look at money mindset over mechanics, Your Money or Your Life by Vicki Robin is the cleanest starting point
Revisit this tutorial once a year. The numbers will have moved. The structure will not.