I've never received $10k in a lump sum, much less $100k. I think the largest lump sum I've ever gotten from any source is around $5k, which was a relocation thing for my current job.

Selling $20k worth of acid in college. Everything else has been salaried or otherwise amortized.

Inheritance. Not $100K, but still high. Paid off my student loans and quit my terrible job for a while.

The biggest lump sum I received was for selling a house we had purchased as a hud repo. After fixing it up, we got a nice profit, plus we didn't have to pay capital gains taxes on the profit since we had used it as our primary residence for enough years.

I believe I know more people who make good, consistent money from on-the-side real-estate transactions than people who make 5-figure yearly bonuses.

185k from a yahoo buying a company I had options in.

My last lump sum was $21,000 for three weeks of consulting (my own practice).

I'm not sure if this counts however, as it's a case of my salary being paid out every three or four weeks (depending on the pipeline) instead of every two weeks.

I've never received a lump sum of more than 20 or maybe 30 thousand at once. I have received a five figure bonus before though.

I made $1750 on a domain sale the other day. That was the biggest lump sum I've gotten in years other than paychecks (which are that exact size).

I'm not very rich.

Largest lump sum was a 45k signing bonus. After tax it was more like 19k (California)

I think I sold a good chunk of Amazon stocks ~ 50k as well (after tax)

$25k, business plan / startup competition

Parents