Should I pay off debt or start saving/investing first?

This is one of the most common money dilemmas and it has a genuinely good framework — the answer hinges on ONE number: the interest rate on your debt. Because paying off debt is a GUARANTEED return equal to its interest rate (every rupee of 20% debt you kill 'earns' you a guaranteed 20% you're no longer paying), and you compare that against what investing might earn (uncertain, ~10-12% long-term average for index funds, with risk). That comparison drives everything: The framework, in order: Step 1 — Build a MINIMAL emergency fund first, even before aggressive debt payoff. ~1 month of expenses (or a small ₹15-25k buffer) in savings. Why before debt? Because without any buffer, the next surprise expense goes straight onto MORE debt, and you never escape the cycle. A small cushion breaks that loop. (Full 3-6 month fund comes later — right now, just a starter.) Step 2 — Kill HIGH-INTEREST debt aggressively, before investing. The dividing line is roughly the return you could otherwise expect from investing (~10-12%). Debt above that — credit cards (36-42%!), personal loans, most consumer debt, buy-now-pay-later — should be attacked with everything spare BEFORE investing. There is no investment that reliably beats paying off a 40% credit card; doing so IS the best 'investment' available to you, guaranteed and tax-free. Investing while carrying 40% debt is mathematically losing money — you'd earn ~11% on investments while bleeding 40% on debt. Clear it first, full stop. Step 3 — For LOW-INTEREST debt, invest alongside it. Debt below ~7-8% — often education loans, home loans, some subsidized debt — doesn't need to be rushed. Here you can (and usually should) do both: pay the debt on its normal schedule AND start investing, because your long-term investment returns likely exceed the debt's cost, and you gain the priceless benefit of TIME in the market (compounding rewards starting early far more than it rewards being debt-free a bit sooner). Rushing to prepay a 4% education loan while NOT investing often costs you money in the long run. Step 4 — After high-interest debt is gone: build the full emergency fund (3-6 months), then invest steadily for the long term, while continuing normal payments on any remaining low-interest debt. So the priority stack: 1. Minimal emergency buffer (~1 month) — so surprises don't create new debt 2. High-interest debt (>~10%) — attack aggressively, before investing (guaranteed high return) 3. Full emergency fund (3-6 months) 4. Long-term investing — while paying low-interest debt (<~8%) on schedule The two errors this prevents: - Investing while carrying high-interest debt — feels responsible ('I'm building my future!') but you're losing the spread every month. Kill the expensive debt first. - Obsessively prepaying cheap debt while NOT investing — feels disciplined but sacrifices compounding years you can never get back. Cheap debt is fine to carry while you invest. One human caveat to the pure math: some people get such a strong psychological boost from being debt-FREE that clearing even low-interest debt first is worth it for their peace of mind and momentum (the 'debt snowball' logic). The math says pay by interest rate; behavior sometimes says pay for the emotional win. If low-interest debt genuinely stresses you or keeps you from sticking to any plan, clearing it first is defensible — the best financial plan is the one you'll actually follow. But if you can handle it rationally: minimal buffer → smash high-interest debt → full fund → invest while carrying cheap debt. That sequence is close to optimal for almost everyone.