Interest Expense Deduction Timing Calculator
Calculate deduction limits and carryforward for interest expenses.
Investment Income
Interest Deduction Limits
| Interest Type | Limit | Carryforward | Form |
|---|---|---|---|
| Investment Interest | Net investment income | Indefinite | Form 4952 |
| Business Interest | 30% ATI | Indefinite | Form 8990 |
| Mortgage Interest | $750k acquisition | None | Schedule A |
Deduction Calculation
Interest Expense:$ 50000
Deductible:$ 25000
Limited:$ 25000
Carryforward:$ 25000
Tax Savings:$ 6000
Limited to net investment income ($25000). Excess carries forward indefinitely.
Carryforward Schedule
| Year | Projected Income | Deduction | Remaining | Tax Savings |
|---|---|---|---|---|
| 1 | $ 31500 | $ 25000 | $ 0 | $ 6000 |
Recommendation
Investment interest $50000 limited to net investment income $25000. Deduct $25000 now. Carryforward $25000 indefinitely. Tax savings: $6000. Generate more investment income to utilize carryforward.
Interest Deduction Key Points
- Investment interest: net investment income limit
- Business interest: 30% ATI limit (TCJA)
- Mortgage interest: $750k acquisition limit
- Home equity interest not deductible
- Investment/business carryforward indefinite
- Form 4952 for investment interest
- Form 8990 for business interest
- Must itemize for mortgage deduction
- Track carryforward carefully
- Generate income to utilize carryforward