Money that arrives unexpectedly gets treated differently from money that is earned. It feels like a bonus in the emotional sense — free, outside the budget, not quite real. Which is exactly why so little of it survives the month.

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Decide before it lands

The single most effective thing you can do is decide the split before the money arrives. Once it is in the account, every day it sits there is a day it can be reasoned away.

A simple, defensible split:

• 10% spend it, deliberately. Not a reward you have to justify — a planned release valve. A windfall you get no enjoyment from is one you will resent saving next time.
• The rest, in order: clear expensive debt, then top up the emergency fund, then invest.

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The order matters

Expensive debt first. Paying off a debt costing 30% a year is a guaranteed 30% return. Nothing you can invest in offers that with certainty.

Emergency fund second. Until it is full, every investment you hold is one bad week away from being sold at the wrong time.

Invest third. This is the part that feels productive, which is why people do it first and then dismantle it six months later to cover a crisis.

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The awkward one: family

For many earners a windfall is not private. Deciding your number before the conversation, rather than during it, is the difference between generosity and an open-ended obligation.

Give deliberately, give an amount you chose, and say what it is. Vagueness is what turns support into something neither side can manage.

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Do this today

Write down your split now, while there is no windfall to argue with. When one arrives, you will already have decided.