Thanks for replying Chris...been doing it that long this way I couldn't remember how I set it up.
It's basically just like putting something away each month for when the money becomes payable but we all know what happens....this way you can't draw something out of it.
You can withdraw the money if you want
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Until the payment becomes "due" then the money is there to do with as you please. It's like a 0% interest savings account if you like lol.
What I like about it is it's very quick and easy to set up the direct debit and even cancel the direct debit if you want. I often pay some in, cancel the direct debit for a while, then when it's close to payment becoming due I set up another dB to cover what's left.
It's the only good thing about the tax system!