The end of the tax year is weeks away. The scramble to use the £20,000 ISA allowance is in full swing. But I see the same mistake constantly: people panic, dump the cash into a Stocks and Shares ISA before the deadline, and then leave it sitting there as cash.
They are terrified of investing it at the wrong time, so it sits in the account doing absolutely nothing.
The Cost of Inaction
Cash drag is the silent killer of wealth. If your money is sitting uninvested, inflation is actively eroding its purchasing power. The tax wrapper protects you from HMRC, but it doesn't protect you from inflation. If you have deposited the money, you must invest it.
If you are terrified of putting a lump sum into the market, drip-feed it. Set up a regular automated investment inside the ISA over the next six months. It smooths out the market volatility and gets your capital working for you.