Jordan has $6,000 on a credit card at 22% APR, $1,200 in cash, and $500/month left after bills. Investing feels urgent. The card’s interest does not wait for motivation.
Sequence, not identity
People often ask “Am I a debt person or an investing person?” A clearer question is: what is the next best job for this month’s $500? That answer can change as cash, rates, and workplace benefits change.
Step 1: Build a starter cash buffer
Jordan’s essentials are about $2,800/month. Cash today is $1,200—less than half a month. Before throwing the full surplus at the card or a brokerage, Jordan first raises cash to roughly one month of essentials (~$2,800). That takes about $1,600 of surplus (a little over three months at $500), or a mix of surplus and temporary spending cuts.
Why pause here? A $600 car repair on a thin cash pile often becomes a new card charge—and the payoff plan restarts. Use the Emergency Fund Calculator to set your own starter and full targets.
Step 2: Show the card math (aggressive payoff)
Assumptions: $6,000 balance, 22% APR, $500/month total payment to the card, no new charges.
- Month 1: interest ≈ $110 → balance after payment ≈ $5,610
- Month 6: cumulative interest ≈ $550 → balance ≈ $3,550
- Month 12: cumulative interest ≈ $818 → balance ≈ $818
- Month 14: final interest ≈ $6 → card clears. Total interest paid ≈ $839
Paying the card aggressively is like locking in a risk-free return equal to the interest you avoid—here, ending the 22% meter in about 14 months for under $850 of interest.
Step 3: Compare “invest while paying the minimum”
Alternate path (same 14 months): pay only $150/month toward the card and put $350/month into investments.
- After 14 months, card interest charged ≈ $1,468 (about $629 more than the aggressive path over the same window).
- Card balance remaining ≈ $5,370—the expensive debt is still mostly there.
- Invested cash contributed: 14 × $350 = $4,900. Even if that portfolio grew at an optimistic 8% annual return (~0.67%/month), the account would be only a bit above $4,900—nowhere near enough to offset both the extra interest already paid and the remaining 22% balance.
At 22%, “invest first” is usually not a close race. The guaranteed cost of the card dominates plausible near-term portfolio gains.
Step 4: After the card, redirect—don’t relax
When the card hits zero, the $500 is already in the budget. Split it: finish a fuller emergency fund (often 3+ months of essentials for stable income), then automate investing. The Debt Payoff Calculator helps set the finish line; the Monthly Investment Calculator helps size contributions once the high-rate balance is gone.
Three scenarios, three different orders
Jordan (22% card): starter cash → attack the card with the surplus → then emergency fund completion + investing. Interest on the aggressive path stays near $840 instead of dragging on for years at minimums.
Alex (low-rate loan + workplace match): $3,000 student loan at 4%, $2,000 cash, $600/month surplus. Employer matches RRSP (or workplace pension) contributions up to 3% of salary—say $300/month of match if Alex contributes enough to capture it. A match is often an immediate, high-certainty benefit; a 4% loan is a much lower hurdle than a 22% card. Sensible order here: keep a cash buffer, capture the full match, then split remaining surplus between the loan and long-term investing (TFSA/RRSP as appropriate).
Sam (foundations already done): $0 revolving debt, ~4 months of cash, $400/month surplus. No high-rate decision left—Sam invests on a schedule.
The interest rate is the decision signal
Rough guide (not a law):
- ~15%+ revolving debt: usually prioritize payoff after a starter cash buffer (Jordan’s case).
- ~6%–10%: judgment call—behavior, match availability, and cash depth matter.
- ~4%–5% fixed loans: often compatible with investing while paying on schedule—especially if a workplace RRSP match would otherwise be missed.
Also stop new charges on the card you are trying to kill. Paying down debt with the tap still open is not a plan.
When the order should change
- A workplace RRSP/pension match appears (or increases)—capturing match dollars can jump the queue ahead of low-rate debt.
- The only debt left is low-rate and amortized—investing sooner becomes more reasonable.
- Cash is so thin that any shock returns to the card—pause extra investing and rebuild the buffer.
- A tiny automatic investment is the only habit that keeps you engaged—a hybrid (minimums + small invest + rest to high-rate debt) can beat a perfect plan you abandon.
Monthly checkpoint
Track three numbers: emergency cash, card balance, and interest charged that month. Watching interest fall (from ~$110 toward single digits in Jordan’s schedule) makes progress visible before the balance hits zero.
Try it yourself
Use the Emergency Fund Calculator and Debt Payoff Calculator, then continue with the Debt Payoff Guide. When you are ready to automate contributions, compare paths with the Monthly Investment Calculator and, for Canadian account choice, the RRSP vs TFSA tool.
To rerun this case study with your own balance, rate and budget, open the pay debt vs invest Money Lab.
Compare the interest you avoid with the return you hope to earn. At 22%, avoided interest is usually the number that makes the order obvious.
Primary sources
CDIC coverage for cash buffers and CRA pages for TFSA/RRSP wrappers when surplus goes to investing. Debt and return figures in the scenarios are teaching assumptions.
Disclaimer: This article is educational and not financial, tax, or investment advice. APRs, match rules, and account types differ. Check your own statements, plan documents, and local rules.