If a provider doesn’t have a tax code for the pot/fund, - and that tax code is apparently attached to each fund/pot and not to its owner nor the person receiving funds from it, - then my understanding is HMRC requires the provider to deduct Basic Rate tax (currently 20% or so) from any payout from it, for sure if Flexible Drawdown.
The idea is that the person receiving the income claims it back from HMRC if there’s a reason they don’t owe at least this amount that has to be deducted for HMRC by the provider. Reasons being such as : they do not have enough total income to have to pay tbis level of tax. Or they may be not taxable in the UK on this money for some other reason :Such as living abroad in a country which has a Double Taxation Agreement (eg France) with the UK that says this money of this type received by this person is not taxable by HMRC.
HMRC has 3 variants of the form to reclaim this overpaid tax ISTR depending on the reason type.
Alternatively, if the person receiving from the fund/pot is normally taxable in the UK at a higher tax rate than the Uk Basic Rate of tax, then the person must pay the extra tax to HMRC. Presumably via their annual tax return.
I also understand that a first withdrawal from any fund, eg a.lump sum withdrawal of up to the “HMRC tax-fee Lump Sum withdrawal of up to 25% of the value of the fund”, if the fund has not had a tax code attached to it (presumbly your submission of the FFI form you got your local Impôts to sign mentioning this fund should result in a no-tax code onto the fund?)…a first withdrawal has swingeing Emergency Tax rate deducted from it.
I don’t know if this applies to the first payment out of an annuity. But for a Lump Sum Withdrawal it’s even worse than you would think as HMRC taxes a first Lump Sum Withdrawal, even within the 25%, as though the same amount will be taken every month and taxes it at Emergency Tax rates. Taking a first withdrawal should trigger HMRC to give the pot a tax code (I was told by 2 providers this is automatic and takes about 2 weeks). But meanwhile HMRC keeps the overpaid tax from the first withdrawal and the person not eligible for UK Emergency Tax must reclaim the overpaid tax from HMRC.
HMRC’s cashflow is enhanced literally by hundreds of billions of £ each year, for this. For some strange reason they haven’t stopped these overdeductions despite calls to do so.
Hence a lot of first withdrawals from UK pension funds are of a £1 or £100 amount, or whatever minimum the fund provider imposes.
But if you live in France, then technically you have already done a first withdrawal by doing this much more intelligent way of reducing the amount of Emergency Tax taken by default by HMRC from your firsr withdrawal from esch pot. And so you technically lose access to the net 6.75% (gross 7.5% less the customary 10%) concession rate by France on a single sum first and complete withdrawal of an entire pension pot/fund. Tbough I gather it might be possible to ask Impôts in advance to agree to the 6.75% if you explain a £1 initial withdrawal might be necessary first for this technical reason.