This points to why repurchase liability studies are so important and having a plan to pay the benefits. You go to an ESOP conference and there are multiple breakout sessions on this topic at EVERY conference. it doesn't matter if the conference is small or large this is one of the big topics. If you think about it an ESOP will most likely in a 15 to 20 year period require most of the outstanding stock to be purchased. I know that doesn't help them now but I thought it was worth mentioning.
You don't really define very large.
However, have them check the document to see if it has the rule that allows the payment to go as long as 10 years if all the conditions are correct. Currently, the break point is if the balance is over $1,105,000 you can add 1 year and than another year for every $220,000 over that up to 10 years. So if this person has say a $3M balance it could be more than 5 years. I would have to do the math when it hits 10 years with these break points. These amounts adj for the CPI each year. These rules are typically some place in the distribution section of the plan document.
If the person isn't retiring for a few years they could put in an in-service provision for people this person's age group (I am thinking he is like 62 to 65 or older for this to work) and allow him to start taking payments now to help stretch things out. So if he is a few years from retirement and they allow him to take a few hundred grand out a year now it should help get the balance down when the installments start. Of course if they have a bunch of people in this age group and they all start taking payments it might be worse. They would have to look at the facts.
I would add it isn't uncommon for a person with these kinds of balances to be a long term employee who has a fair amount of loyalty to the company. A conversation of the situation and setting something where he chooses to take something less than a full payment (might require some kind of amendment once again) has happened before. it isn't really in his best interest to cripple the company with his first few payments either.
In the extreme there are stories of ESOP companies that have to sell themselves because they can't fund the repurchase obligation.