BBCWatcher
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Your tax relief is limited to $7K per year of top up into your SA. Your SA is limited to the Full Retirement Sum, which is $166,000 in 2017 and adjusted upward periodically. It takes a couple decades at $7K/year to reach the FRS if that's the only source of funds into your SA.if i xfer from OA to SA.. it limits how much cash i can topup to my SA.. part of it is for tax relief, part of it because i want more funds in cpf
However, I think you're missing part of the picture. Let's suppose you're a baby born in Singapore with a generous aunt or grandfather (for example). That generous person tops up the baby's SA in one $166,000 payment. The benefactor receives no tax relief for that top up -- not even the $7K. (The tax relief is only potentially available when you top up your own account or the accounts of certain specific family relatives, such as your spouse, who has limited income.) So no tax relief, but...that $166,000 has a LONG growth trajectory with compound interest. Also, compulsory CPF contributions into SA still go into SA, and also earn attractive interest. In short, while the tax relief is important, compound interest and compulsory contributions are also important. So if you want huge CPF, then being something at least closer to that lucky baby is a smart idea.
Also, even when your SA reaches the FRS, you can still top up your other accounts (OA and MA). If you top up MA then you can get tax relief, but your MA top ups are subject to the CPF Annual Limit (currently $37,740). Meaning, the compulsory contributions (you and your employer) plus your top up cannot exceed $37,740 per year. Once your MA reaches the Basic Healthcare Sum (BHS), currently $52,000, then both compulsory and top up contributions stop. Compulsory MA contributions then roll over into your SA. You can also top up all three accounts (OA+MA+SA), with no tax relief and still subject to the $37,740 Annual Limit. If MA and SA are already "full," then such top ups will flow into OA.
Anyway, OA to SA transfers can still make a lot of sense due to compound interest and compulsory contributions, even while you're trying to take advantage of tax relief. There's a lot of merit to making the highest yielding parts of your CPF (SA and MA) big sooner. Like those few lucky babies.
Another interesting "quirk" is that top ups to SA must be paid out as life annuities whereas that's not necessarily true of OA to SA converted funds. For example, if you end up with $100K of top ups into your SA but also with a property pledge, you won't have the option to choose the lower Basic Retirement Sum-based CPF LIFE annuity even if you want to. You'll have to choose the minimum annuity that's large enough to include all your top ups (plus the interest on those top ups, if I understand it correctly). Maybe that isn't a problem, but it's something to be aware of if your SA will have a relatively large fraction of top ups and if you were trying to minimize CPF LIFE annuity payouts and instead let your CPF funds earn ordinary attractive interest.
Anyway, I convert OA to SA, and I also top up SA. I don't need OA funds as OA (won't be using them for housing), so every month I convert those funds. The SA is zooming up. I also have a bit of room within the Annual Limit to top up MA, so I do that, too. MA is zooming up, too. I expect the MA will hit its BHS first, and then compulsory MA contributions will start rolling over into SA, turbocharging its growth. It's all good stuff.
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