I owed about $40,000 on federal taxes from not filing and not paying for about 7 years. Long story short....I was told that if the amount is under $25,000 then they will be very flexible on your payments. Over a five year period (60 months) the 12k comes out to about $216 per month. If I was you/them...I'd set up at least that amount and then DO ALL I COULD to pay more than that each month. if not...the interest (I heard) is even worse than if it was on a credit card. I paid about $10 grand more in interest on my debt in 2 1/2 years. I did every thing I could to pay them off as quickly as possible.
If I was you...I'd research on the internet before paying any company who claims they can help you any money. I found it to be a complete sham and something you can do on your own.
The IRS reps. give you their ID number when they first pick up your call. Be ready and right this down each time you call them, just in case something happens and they send you papers that are different than what you talked about.
ALSO....they type in notes on your screen when they talk to you, so if they say they will do something (favorable) to/for you then specifically tell them to put that in the notes. Make sure you hear them typing or they will put you on hold so they can update the notes.
ALSO....some IRS agents are A-hole's and some are nice. If I were you/(your parents) I'd write down their ID number, immediately tell them that you (your parents) have a cordless phone and sometimes the battery goes out and you'll call right back if it goes out. This is in case you get a real butt head. You can hang up on them, claim it was the phone and then call right back and hopefully get a nicer person. Make sure you tell them that the cordless phone went out on you in the middle of your conversation the last time and to make sure the previous person didn't put down in your notes that you are combative or difficult person. (They will do this and then antagonize you on the phone to get you to lose your cool to say and make stupid mistakes.)
If they only owe 12K, you don't need anyone to make a payment plan for you. You/they can do it themselves and they will accept it if it's not $25 a month. I'd tell them $225 a month and they should go for it. If they've already filed for those years and the IRS has sent them a tax bill...you may be able to set a payment plan up over the phone using the automated computer voice response thing-a-ma-gig and not even talk to a live person. They will send you a letter letting you know if your payment amount is acceptable or not. Make sure the computer response tells you you have a debt that's due. I'd try that first before talking to a live person, because they will try to get you to pay as much as possible, even though you can pay less each month.
Make no mistake....the interest will mount up if they don't pay it off quickly. I wouldn't be surprised if they end up paying 5-6k in interest over a 60 month period if they only pay the minimum due. I know first hand.
As far as knocking down some interest for one of the years....I was told that you can only do it one year at a time (since they have two years due). More than likely they will only knock off the interest and penalty for one of the years if it is a very, very good excuse. Then after that...you can try to get the same thing done for the second year, which will be alot harder.
If any of this doesn't make sense or is confusing...I'll try to explain it another way.
It's not as bad as you might think, but time is against them because of the interest.
All 3 Fico scores 800+