My mum has US citizenship but has lived in the uk for 55 years (indefinite right to remain), I have not lived in the US but as she has US citizenship (I) have dual citizenship.
Are you sure you have dual citizenship? Either you were born in the US, or your mother must be over 70 years old.
We contacted a lawyer hoping they might be able to sort it out and we were quote 1000 GBP per person to do it.
The lawyer would have to use the
streamlined process to enable you to come into compliance. £1,000 for 3 years of returns, plus the current year is a reasonable charge. You could do this yourself using the free fillable forms from the IRS site.
They said you need a lawyer to argue to the IRS that you haven't been avoiding paying taxes maliciously.
It's most (very) unlikely the IRS would question the returns to the point of needing representation.
1) Is it complicated to start filling in tax return yourself if you have never done so, if so where should we find the forms to do so
Is it complicated? That depends on how comfortable you are with completing strange forms. The forms can be found here:
https://www.irs.gov/forms-instructionsYou will need at minimum forms 1040, Schedule B, and either 2555 or 1116 (and its associated form B), and either schedule 1 or 3 for the 1040.
2) are we likely to get fined for not doing so in the past?
If this is your first contact with the IRS,... no. If there is no tax due (thanks to either 2555 or 1116) there can be no penalty.
I would agree with
tubaleiter. You need to consider the implications going forward, and $3,200 (if it's still available), in my opinion, does not even begin to compensate you for future time and effort, or cost if you employ someone, in addition to all the complications financially. For example, do you have a stocks and shares ISA? For the mother to have at least 18 months of US employment (using the US social security / UK DPW Totalisation treaty) is, in my opinion, not worth the extra income from a US SS pension. That limited pension would be based on work income from over 55 years ago. US SS is based on income earned, and only partially (to qualify) on number of years contributions as in the UK.
In this case, and given the mother's age, the only true reason for coming compliance is your conscience and peace of mind, along with any future plans to live permanently in the US.