You will decide whether and how much to top up, weighing the tax saved against the money locked away.
It was the first week of December, and Shu Ting had a decision to make before the CPF Board's year-end cut-off. She knew from lesson 3.1, Tax relief on CPF cash top-ups, how the relief worked. She knew from lesson 3.3, The relief cap and the order you claim in, that she was far below the cap. What she didn't have yet was an answer: top up or not, and how much.
This exercise gets you to that answer, with numbers and a date. You'll need your rebuild sheet from lesson 1.4, Rebuild your tax bill from scratch, your relief list from lesson 2.5, and your CPF account open in another window. Allow about twenty-five minutes.
Pick two top-up amounts you could realistically make, one modest and one larger, both within the current IRAS limit for that kind of top-up.
Add two rows to your rebuild sheet. In each, take your expected chargeable income for the coming year, subtract the top-up, and run the result through your band formulas. The tax saved is the difference between your current tax and the new one. Don't multiply the amount by your marginal rate and stop there. If the top-up pushes you into a lower band, part of it will save less, and only the full calculation shows that.
Shu Ting priced a top-up to her mother at S$4,000 and S$8,000, both example amounts. Her expected chargeable income was S$83,000. Under the practice table from lesson 1.4:
S$4,000 would bring her to S$79,000. The first S$3,000 comes out of the 10% band and the last S$1,000 out of the 6% band. Tax saved: S$300 plus S$60, which is S$360. S$8,000 would bring her to S$75,000. S$3,000 at 10% and S$5,000 at 6%. Tax saved: S$300 plus S$300, which is S$600.
So the second S$4,000 saved only S$240, compared with S$360 for the first. That is the band edge at work. Her chargeable income sits just S$3,000 above it, so most of any top-up is relieved at 6%.
For each amount, write one line on when the money could next be used, and for what.
A top-up to yourself goes into your own CPF retirement savings. Before 55 it can't come out, and after that it mostly comes back as monthly CPF LIFE payouts. A top-up to a parent belongs to that parent from the moment it lands. It raises their retirement income, and if they die, what's left goes to their nominees. Either way, treat the money as gone from your own spending for good.
Shu Ting wrote: "Mum's RA. Raises her monthly payouts. Never comes back to me."
Now open your budget and goals. After the top-up, would your emergency fund still be whole? Would every goal in the next three to five years still be funded: a flat, a renovation, a wedding, a course, a career break?
If the answer for either amount is no, cross that amount out. The relief doesn't rescue a top-up that leaves you short. Taking a S$600 saving and then borrowing S$3,000 on a credit card in March is a loss.
Shu Ting's emergency fund was in place. The larger amount would have delayed money she was setting aside for Wen's infant care fees. The smaller one didn't touch anything.
This is the step that keeps the decision honest. Ask yourself whether you'd make this top-up if the relief disappeared tomorrow.
For a top-up to a parent who needs more retirement income, the answer is often yes, and the relief becomes a bonus. For a top-up to yourself, made only because December came round, the answer is often no. That doesn't make it wrong, but it means the money must be money you're sure you'll never need before retirement.
Shu Ting's answer was yes. Her mother's payouts were small, and a top-up would raise them for life. The tax saved was a bonus on a decision she'd make anyway.
Your decision sheet ends with one line per top-up: amount, tax saved, where the money goes, the date you'll pay it, and one sentence of reasoning.
Shu Ting's read: "Top-up to Mum, S$4,000. Saves S$360 tax (practice table). Goes to her RA, raises her payouts, doesn't come back. Pay by 5 December to clear the cut-off. Reason: she needs the income, the larger amount would delay Wen's care fund. MediSave contribution from lesson 3.2 left for another year."
She added a note for module 4: her marginal rate after this top-up would be 6%, which would matter for an SRS contribution.
Now do the same with your own figures. Write the line for your own top-up decision, even if the decision is not to top up this year.
Write your top-up decision with the amount, tax saved, money locked, the date you will pay it and your reason.
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