Methodology
Last Updated: March 24, 2026
This page explains the reasoning behind the affordability score. The score is not a credit score and not a lending decision. It is an educational composite that combines cash-flow pressure, liquidity after the purchase, debt load, and financing cost.
The model is intentionally conservative. It is built to highlight strain and trade-offs, not to maximize the amount a user feels permitted to spend.
Primary inputs
- Income available after taxes
- Recurring fixed expenses
- Existing monthly debt obligations
- Current savings and projected savings after the purchase
- Purchase size, financing type, APR, term, and down payment
- Optional future-risk signals such as upcoming large expenses
Primary evaluation themes
1. Monthly affordability
The model estimates how much disposable income remains after recurring obligations, then measures what share of that remainder would be consumed by the purchase payment.
2. Liquidity after purchase
Cash reserves matter because they protect against uncertainty. The model checks how much savings remain after a down payment or cash purchase and compares that to an emergency fund target.
3. Financing efficiency
APR and total interest cost influence the score because a manageable payment can still be expensive over the full term. Market-rate comparisons are used as a benchmark rather than a promise of what any lender will offer.
4. Overall risk
Higher debt obligations, low savings, aggressive payment ratios, or large upcoming expenses reduce the score because they increase the chance that the purchase becomes financially stressful.
How to interpret verdicts
- Comfortable: The purchase appears supportable with a reasonable margin for cash flow and savings.
- Stretch: The purchase may be possible, but it reduces flexibility and deserves caution.
- Risky: The purchase creates meaningful pressure on cash flow, reserves, or both.
- Not advised: The current inputs suggest the purchase is likely to weaken financial resilience too much.
Limitations
- The model cannot account for every personal circumstance.
- Users who omit expenses or debt will receive an incomplete assessment.
- Interest-rate benchmarks are market indicators, not guaranteed offers.
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