Negotiations on starting salary when current salary low

[Verylongweek]

Hi

I’ve just been put to final stage for a new job. The advertised salary for the role is “up to £48K per year” which is £13k more than my current salary so quite a large jump % wise at the top end of that. However I’m am currently vastly under paid for my position level (one of the main reasons for leaving) and the £48k is around industry standard.
I was hoping to avoid the currently salary question and just discuss what I am worth. However at the last round they asked currently salary and i frozen up and just told them, I did caveat that I knew it was very low and one of the reasons for looking else where.
They seem very keen on my experience and have said they are not looking at anyone else and that the final stage is more for me to make a decision based on company culture etc.
My question is, is they offer much below the advertised “up to” salary. What is the best way to go about negotiating it, when what they may offer will already be far more than I am on currently.
I’m really poor at talking money, Hence me finding my self in the position of currently being under paid.
Any advice/tactics greatly appreciated.

I guess you know in your head what you'd be willing accept. So if they come to you with a low offer you need to say 'thank you, I would love to work for ABC Ltd, but I'm afraid I couldn't accept a salary of less than 45k'. If you don't get the new job I'd definitely talk to your current boss about a pay rise, 'I've aware my current salary isn't in line with the industry standard....'

Thanks.
I think that’s it I just need to politely stick to my guns. I know they are more than happy to pay, I just feel they may think they should get a bargain with me as currently underpaid. A raise where I am has been made clear as a no go (plus there are other reasons I’m pretty desperate to get out tbh) will be interesting when the time comes to try and replace me for the same, I think they are in for a shock.

Could you apply for a job advertised at the dairy you want and just say actually I’m in the running for another role with x salary, so that’s what I would need

To clarify I meant a shock in terms of people’s salary expectations for the role, I’m under no illusion I’m irreplaceable 😁

Salary I mean. Who knows where dairy came from!!

I’m not sure I’m much of a skill match for a dairy job 🤣
Other issue is I am a shocking liar, so concerned about making up another role.

No I don’t think you should make one up - really apply

Very good point.
My roles quite rare, especially outside of London, this is the first one to come up in last 6 months in my region. But I could just apply for something similar knowing I’m unlikely to get interviews.

You don't have to tell them current salary even if they ask. It's ok to say "I'd rather not disclose that; for this position I'd be looking for salary of x."

Current salary questions are a bit of an issue because they perpetuate unfair salary ranges - it's particularly a problem for women.

Personally, I am paid quite a lot, but because I disagree on principle with "current salary" questions due to the above, I would politely decline to answer the question.

I'd wait to see what they offer. To be honest if they try to get you on the cheap I'd worry about what it says about them as an employer. I'd hope they'd offer a sensible market rate salary and the question about your current salary was only to ensure that they equalled or bettered it (they presumably weren't to know you were being so underpaid). Good luck!