RE: Dividends3 Jan 2019 12:12
Discussing dividends within an ISA and SIPP is a red herring, they are not taxable on receipt by the wrapper and once received they just become part of the balance.
There is no tax on any withdrawals from an ISA. Dividends are received by the ISA and simply added to your cash account. The only limit on ISAs is the initial annual investment amount, £20k per annum.
There is also no further tax due on dividends received by a SIPP but any withdrawals are potentially taxable apart from the 25% tax free element. I say potentially as it depends on other income.
Dividends are taxable on receipt personally or if into your normal trading account and need to be declared in your annual tax return (you have to declare them, not being sent a tax return is not an excuse). So, if received before April 2019 you need to add them to your tax return which needs submitting before January 31st 2020.
You then have a £2000 tax free allowance and any others that fall into your basic rate band, sub circa £48k, are taxed at 7.5% so still quite attractive.
Hope that helps...