https://blog.monkeytactics.com/tags/saving/ Recent content in Saving on MonkeyTactics Blog Hugo en-us Tue, 13 Oct 2026 00:00:00 +0000 https://blog.monkeytactics.com/posts/compound-interest-extra-100-a-month/ Tue, 13 Oct 2026 00:00:00 +0000 https://blog.monkeytactics.com/posts/compound-interest-extra-100-a-month/ <p>An extra $100 a month adds up to $1,200 a year. Over 30 years, that is $36,000 of additional contributions. But when those contributions earn returns that stay invested, the difference in the ending balance can be much larger.</p> <p>How much larger depends on the rate, time horizon, contribution timing, and taxes. The number on the screen also needs a second question: what could that future balance buy?</p> <p>This guide uses the <a href="https://monkeytactics.com/tools/compound-interest-calculator">MonkeyTactics Compound Interest Calculator</a> to compare $200 and $300 monthly contributions, separate deposits from growth, and translate future dollars into today&rsquo;s purchasing power. Every worked balance below was checked against the calculator&rsquo;s production WebAssembly engine.</p>