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Replace proportional split with a fill-first loop that allocates min(remaining, deficit) to each matched month in user-supplied order, where deficit = expected - already_paid. Prior transactions' contributions are now properly accounted for, so a second payment on overlapping months fills only what's still owed instead of splitting proportionally by total expected. Surplus after all deficits are covered goes to the credit bucket. Fixes: Matyáš Thér 200+550 showing 566/183 instead of 500/250. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>