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buyer also invests monthly savings when buying is cheaper than renting

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Johannes
2026-03-20 02:25:40 +01:00
parent 8e452f484c
commit ba906bf35e
1 changed files with 10 additions and 9 deletions
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19
calc.js
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@@ -75,20 +75,21 @@ function run_simulation(p) {
yr_upkeep += prop_tax_m + maint_m + insurance_m;
cum_buy_cost += total_buy_m;
buyer_portfolio *= (1 + invest_r_m);
const selling_costs = home_value * (p.closing_sell_pct / 100);
const buyer_nw = home_value - selling_costs - balance + buyer_portfolio;
// --- rent side ---
const renters_ins_m = p.renters_ins / 12;
const total_rent_m = monthly_rent + renters_ins_m;
yr_rent += monthly_rent;
yr_rent += monthly_rent;
yr_renters_ins += renters_ins_m;
cum_rent_cost += total_rent_m;
cum_rent_cost += total_rent_m;
// renter invests the difference if buying is more expensive
const monthly_delta = Math.max(0, total_buy_m - total_rent_m);
portfolio = portfolio * (1 + invest_r_m) + monthly_delta;
// each side invests their monthly savings vs the other
const rent_delta = Math.max(0, total_buy_m - total_rent_m);
const buy_delta = Math.max(0, total_rent_m - total_buy_m);
portfolio = portfolio * (1 + invest_r_m) + rent_delta;
buyer_portfolio = buyer_portfolio * (1 + invest_r_m) + buy_delta;
const selling_costs = home_value * (p.closing_sell_pct / 100);
const buyer_nw = home_value - selling_costs - balance + buyer_portfolio;
// apply capital gains tax on portfolio gains when we "cash out" at end
// (we track gross portfolio, deduct tax in summary)