A tax bracket is an income range taxed at a specified marginal rate. Tax planning therefore depends not only on total income, but on when income is recognized and which bracket receives each additional dollar. section 9.1.2 section 9.2.2
Why stable income can reduce tax
With simplified brackets of 12% through $100,000 and 22% from $100,000 to $300,000, income of $50,000 then $150,000 produces $29,000 of tax over two years. Keeping income at $100,000 in each year produces $24,000, because no income reaches the higher rate. section 9.1.2
Table 9.1 Simplified tax brackets for our example
| Tax rate | Income range |
| 12% | 0 – $100,000 |
| 22% | $100,000 – $300,000 |
Inspect the simplified income ranges and rates used to compare uneven and even annual income. section 9.1.2
A practical tax model stores bracket ceilings and rates in a table, subtracts a standard or itemized deduction from income, and taxes each successive slice of taxable income until all income is assigned. That calculation can then support withdrawal planning: an IRA distribution is ordinary income, so the gross withdrawal must cover both spending and the resulting tax. section 9.2.2
Bracket-aware withdrawal decisions include:
- Smooth withdrawals across years when possible, avoiding unnecessary income in higher brackets. section 9.1.2
- Compare an account owner's bracket with beneficiaries' brackets when choosing whether to deplete or preserve a traditional IRA. section 9.3.2
- Account for capital gains separately: ordinary income is taxed first, and capital gains stack above it, so added ordinary income can move gains into a higher capital-gains bracket. section 9.3.3
Stacked capital gains
Under simplified rates, $80,000 of ordinary income plus $40,000 of long-term gains yields $12,600 of total tax: $20,000 of gains remains in the 0% capital-gains range and $20,000 is taxed at 15%. Raising ordinary income to $90,000 leaves only $10,000 of gains at 0% and raises total tax to $15,300. section 9.3.3
Table 9.8 Example of capital gains taxes stacked on top of ordinary income
| Type of tax | Amount of tax |
| Ordinary income | $80,000 × 12% = $9,600 |
| Long-term capital gains | $20,000 × 0% + $20,000 × 15% = $3,000 |
| Total | $12,600 |
Trace how ordinary income fills the lower range before long-term capital gains are assigned their rates. section 9.3.3
Bracket effects are investor-specific. Asset-location comparisons can use separate ordinary-income and capital-gains rates; for example, assumed 35% ordinary-income and 20% capital-gains brackets change the relative tax efficiency of payouts, turnover, and asset types. State taxes may also be incorporated as rate attributes. section 8.2
