Time is ticking for me to max out my ISA allowance earlier than the present tax 12 months slams shut. So I’m trying to find the perfect FTSE 100 shares to purchase to make full use of my Shares and Shares ISA.

Any of the £20k allowance I don’t use can’t be prolonged into the 2025/26. In fact, I don’t really need to purchase any securities to utilize it. Moderately, I simply must have the cash deposited in my Shares and Shares ISA to shelter myself from capital good points tax and dividend tax.

However the distinctive worth on provide from many Footsie shares means there’s no level in my delaying. With this in thoughts, listed below are simply a few blue-chip shares on my watchlist at present.

Fresnillo

Hovering treasured metals have powered Fresnillo‘s (LSE:FRES) share price to two-year highs. But at 947.5p per share, the gold and silver producer nonetheless gives glorious worth on paper.

A ahead price-to-earnings (P/E) ratio of 14.9 instances isn’t a lot to get enthusiastic about. However its corresponding P/E-to-growth (PEG) ratio is.

With Metropolis analysts tipping a 126% earnings soar in 2025, Fresnillo shares deal on a PEG nicely under the worth threshold of 1, at 0.1.

There’s no assure that safe-haven demand for treasured metals will hold rising. Commodity markets are notoriously risky, which means Fresnillo stays vulnerable to a price reversal.

However as issues stand, issues are wanting good for silver and gold (which final week hit its seventeenth new file excessive in sterling phrases in 2025 alone).

Issues over the geopolitical and financial insurance policies of the US Trump administration proceed to mount. Fears over authorities debt, and escalating conflict in Europe and the Center East, are additionally supporting flight-to-safety property.

Fresnillo’s portfolio of eight working mines makes it an particularly enticing gold inventory to me. In contrast to smaller operators, it’s capable of higher take up localised issues at group stage.

Coca-Cola Europacific Companions

Coca-Cola Europacific Companions (LSE:CCEP) has simply rolled into the FTSE 100 from the FTSE 250. It joins Coca-Cola HBC, which sells the identical vary of market-leading drinks (together with Coke, Fanta, and Costa Espresso), simply in a special a part of the world.

As its identify implies, the enterprise sells product into European and Asian markets, 31 in all. Its footprint contains a mixture of developed markets (such because the UK, Germany, and Australia) together with rising areas (together with Indonesia and the Philippines).

This offers the corporate stability in addition to thrilling gross sales alternatives in faster-growing territories. It’s a combination that drove gross sales 11.7% increased over the course of 2024, to €20.4bn.

Like Fresnillo, Coca-Cola Europacific’s ahead P/E ratio of 20.6 isn’t particularly low on paper. Nevertheless, a predicted 27% earnings improve this 12 months additionally leaves it dealing on a rock-bottom PEG a number of of 0.8.

The enterprise has to spend fortunes in advertising to remain forward in a aggressive business. It’s additionally susceptible to adversarial trade charge actions.

However on stability, I feel it’s a prime inventory to contemplate this ISA season, together with that blue-chip treasured metals producer.