How to make a one off payment

First post, sorry if its long.

I own my own limited company and pay maintenance on my earning (wages and divis) through CSA2 rules.
My relationship with my ex is very acrimonious but I have always put my children first and been open and honest with the CSA about my income and pay accordingly.

My ex has now handed me a bill, via my daughter, for 50% of the cost of my daughters dental care which I was completely unaware of and for which she has arranged everything. The bill is for £1600 which I do not have and I know that my ex has dental insurance for my daughter (of which I assumed my CM payments went towards) so she is actually after more than 50% from me while trying to be clever about it. She has also included a loan/finance option form from the dentists for me.

Although I cannot afford that amount I would like to contribute something towards it. I had hoped that by taking out a bonus in the form of a dividend from my company and by declaring that to the CSA I would be put into arrears and have to pay a lump sum to my ex. However, the CSA say that I cannot declare this and would have to get my ex to do so and it would just change my weekly payments going forwards. I can only afford this ''bonus'' because I have been very careful during the recession to leave decent operating capital in my company. I could not afford the increased income level to carry on.

As stated, my relationship with my ex is very bad and she has accused me of living like a millionaire to the CSA and I have been through a horridly stressful tribunal on the basis of made up evidence from her - all disproved on the day. She has used the CSA as a bully boy time and time again to get at me and each time I have walked away innocent of her accusations but each time the stress of it adds up and I feel very down which causes further stress of my current marriage.

I suppose my question is; can I make a one off payment through the CSA without my weekly statement being changed?

If you pay via the CSA then you can only pay the assessed amount. If you pay extra now then it will just reduce the amount you pay at some time in the future as you will be in credit.

Obvious question though given your relationship with your ex is why pay something towards a bill that you didn''t agree and can''t afford?

It isn''t going to make any difference to your daughter as the treatment has already been carried out but it wont matter what your contribution is in the eyes of your ex it wont be enough.

All you will be doing is playing into your ex''s hands as she will keep asking for more and more and putting pressure on your current relationship.

You don''t mention your daughters age but may be best to not say any more about it and don''t even mention it to your ex.

I''m not sure about this but I thought children''s dental treatment was free? Or that has been the case with mine so far anyway - as long as mine have been in education I''ve not paid even for a check up? My son had some treatment at hospital at one point I didn''t pay anything then either? Am I missing something or is the treatment cosmetic or something for which there is a charge?
Like WYSPECIAL says your ex didn''t mention this treatment before or ask you prior to the treatment . - just pay the CSA payments you should pay and no more otherwise she will always be coming back for extras. If it makes you feel better to make a small contribution do so but make her aware it''s a one off and don''t pay anymore than you can afford.

Sorry, I should have explained better.
The dental work is for braces for my 12 year old.

My ex has explained to her that without me paying for half she can''t have them.
I''m in a position where if I say no I''ll be made out to be the bad guy and my daughter is heavily manipulated as it is.

Last year she stopped coming to mine for 3 months because I wouldn''t go to the bus stop near my ex''s (12 miles away)to collect her on our Friday nights when the school bus I''d arranged for her to travel on stops outside our house.
The manipulation she is under is very intense and she believes everything her mother tells her regardless of the truth she sees with her own eyes. Its all very very upsetting and I fear for her mental wellbeing all the time.

Do braces not fall under the NHS anyway? I know mine did but thats going back about 15 years now. If not i better start saving now just in case!!

Braces can now come under cosmetic so are no longer free. Its can come to a dentist judgement.

Most have payment plans so cost can be spreadout throughout treatment.

Thanks.
I think I need to contact the dentists she is using, they have been recommended by my ex''s cousin who is their normal dentist.
Call me paranoid but I suspect there might be more to this than I''m being told.

If the NHS are willing to pay for the cheapest option, but the patient chooses the more expensive option does the patient only part fund the braces (the increment) or would they have to fund the whole cost?