Sometimes a large purchase can help you save money in the long term, so it makes sense to spend a lot.
This can be difficult for a diehard penny pincher to swallow. The golden rule is to look at the amount you'll save with the purchase and then work out how long it will take to make back what you spent and start benefitting.
Here are five examples of when it can make real sense to splash out.
Insulate your cavity walls
One in 10 UK homes doesn't have insulated cavity walls, meaning the homeowners are potentially missing out on hundreds of pounds worth of savings a year.
Cavity wall insulation typically costs around £500, according to the Energy Saving Trust, but most major energy suppliers will subsidise this cost as part of their Carbon Emissions Reduction Targets.
Some energy providers don't even restrict the offer to their own customers, as they need to support a certain number of green home improvements.
That brings the typical cost down to an around £250 for a typical home. The trust says that can save around £110 a year, allowing you to recoup the cost and start seeing savings in less than three years.
Buy a bigger freezer
If you have space for a large chest freezer, you could save a small fortune by freezing surplus food and cutting back on waste.
Meat, fish and ready meals are some of the priciest products on a shopping list so it's worth always checking the use by date when you buy them. If there's a chance you won't eat them in time then freeze them.
But if you only have limited freezer space then you may not be able to store as much as you need to, so it could be time to upsize if you have the space. High-spec freezers cost more but a quick look on the Currys website shows models from £129.99.
The campaign organisation Love Food, Hate Waste reports that the average family throws away £50 worth of food every single month. On average!
Even if you assume that around half of that isn't suitable for freezing, you could be saving money within six months.
Pay your premium outright
It can feel much easier to pay for your car or home insurance monthly instead of in a lump sum but this can be a false economy.
By spreading your premium payments, you're effectively paying for credit, and this can add substantially to the cost.
For example, I've just run a car insurance comparison for my vehicle and the best price offered is £689.84. But if I want to pay monthly, it's an initial deposit of £137.97, then 10 payments of £61.81. That adds up to £756.07, which is £66.23 more overall.
Take out a season ticket
If you're commuting by rail then you could save a lot of money by buying a season ticket. You can buy a season ticket for up to a year and the savings can be substantial.
Take the London Underground, for example. If you buy a day ticket to travel in zones one and two, it costs you £8 (although it can be cheaper with an Oyster card).
Make that purchase five days a week for 48 weeks a year and you'll pay £1,920 in total.
But you can buy an annual pass for £1,104 — saving you £816.
Insulate your loft
As with cavity wall insulation, lining your loft can reap some substantial savings after a short period. The older your home, the higher the potential savings.
Loft insulation can cost around £250 if you want it professionally fitted, although you can do it yourself for less.
According to the Energy Saving Trust, putting loft insulation down in a house that has none will save around £145 a year. Increasing the thickness can save you around £40 a year.
So, even if you get a professional to install it, you could get back what you've spent in under two years, or just over six years if you've just raised the level.
Savings that make sense
If you're thinking of splashing out some cash in order to save money in the future then make sure the savings make sense.
After all, if you buy an ice-cream machine for £100 but only save 50p each time you use it, you'll need to make 200 batches before you start actually saving cash.
It's not always easy to find a large lump sum, so it's worth considering where you can make the highest savings and targeting your money accordingly.
Felicity is Yahoo! Finance's new money-saving columnist. If you have a money-saving scheme you'd like to see tried out then let us know in the comment box below.


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