I have a customer who is on their 8 week clock, but cannot open. They hope to open during week 8. For them, paying a retention bonus makes sense for PPP forgiveness, as well as to entice some employees to get off the dole. It is a fine line as some want to stay on their 39 weeks of dole, as it is more income, but a rehire offer ends their UI eligibility. The employer is likely to "ask" who wants to work, with the retention bonus, rather than just rehire or quit option. Those who do not return will never be offered their position back.
They are rehiring some now, and working them part time, with full time payment, doing things they can do while closed.
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EmployER paid retirement contributions are plainly countable as forgivable expenses. The dilemma is a moral one, as it is with any item you pay in your 8 week window which is not normal during that specific 8 weeks. If, for example, you would have paid into an SEP at some point during the year, and pay the same amount during the 8 weeks, that is just a timing issue, which many can live with (unknown about the bank auditor). If you start a new SEP plan, as a way to maximize, then it gets grey (at least). If you start an SEP or make an extra contribution, just to maximize, it may be harder to live with. If there is a deeper audit, by someone who gets payroll processing, then any out of cycle items could be flagged.
Many employers will be altering their payroll cycle to weekly, with a payday on or about day 1. Many employers will be paying three months of health care expenses during their 8 weeks. Easy, and probably will not be questioned, as it is just a matter of paying the third item a little earlier than normal, such as the day the bill comes in instead of the due date. Watching out for easy to see prepayments will likely be needed.
I suspect, but we cannot know yet, banks will have a set of audit guidelines. They will want actual tax type forms, check stubs/direct deposit records, and other actual documents, lease, retirement plans, etc. The bank has no incentive either way, as they are fully insulated (and paid well) as long as they perform good faith. I have been approached by a few people looking to back build payroll records, which I kindly decline (there are experts saying use some sort of payroll software, not hand done payroll).
PPP forgiveness, can be easy, if one just pays as normal and does not worry about forgiveness maximization. Those that seek to optimize will work at it a little. Those that want to maximize will work at it a bunch, and take some risks.
Likely, by judging carefully the bank's application process details, one can make a reasonable guess as to their forgiveness "details".