@MikeRafone
With the example of additional costs I’ve given, and the interest rates you’d suggested, you’d actually end up with roughly the same amount of money in the bank.
Why? Because you’re using the savings (low interest rate) to avoid going further into debt on that eye watering CC high interest rate loan. Yes, you pay off the CC sooner with your model, but not soon enough to catch up on the slow but steady savings.
As someone points out up thread, debt is often due to impulse buys and psychological reasons (like wanting to give the kids great Christmas presents).
In plan A (Put it on the credit card and keep throwing as much as you can towards the debt), you’ll pay the debt off faster. But, you’ll still be in an ‘financial emergencies can be solved by credit cards’ mindset, because that’s what you’ve been doing.
You’ll also have extended your repayment period twice, which can easily make people think they’re never really going to pay this card off, so why not use it for the kids Christmas presents?
In Plan B (Build up savings as well as paying off the card) you’ll hopefully learn that you can meet emergencies without going into debt. Yes, your savings will have been almost used up at one point - but that’s what they’re for.
The credit card payments will have taken exactly the time you originally planned, so that also will encourage you that any remaining debts are equally solvable.
And finally, in Plan A you need to decide to repurpose all your previous card payments to a saving plan. Frankly, most people don’t. They decide they’ ve now got £300 extra to spend. In Plan B there’s a good chance that savings direct debit will just keep rolling…
It’s psychological - the right decision often depends on being honest with yourself and deciding which method is going to not just get you out of debt, but keep you there. If you decide the only real solution is cold turkey on the credit cards and to develop a savings habit, Plan B is more expensive in the short term, but might be cheaper in the long term.
Because you’ve learnt how to live within your income. Which is hard.