Thought I'd throw in a personal story, since this is what I'm dealing with right now.
Last year I started getting my finances together, motivated largely by MMM. At the time I was keeping $10k in my checking account as an emergency fund. I also had a HELOC with a $30k limit and a $4k balance, with no other debt save the mortgage. I was putting $7k per year in my 401(k).
After reading the
Springy Debt blog post and thinking about it, I decided to put that $10k of cash to work. I put $5500 into an IRA for the year and upped my 401(k) contribution so that I would max out for the year in the last five months. That was about 75% of my salary, so I used the rest of the cash to cover living expenses for the rest of the year.
This spring the HELOC balance was zero and my monthly 401(k) contributions are set to hit the limit. In May I bought a car and I took $3k out of the HELOC to pay for it. No problem - the HELOC is there to smooth the cash flow just as a cash emergency fund would. But now, I find I need a new roof on the house. That's going to be about $16k. So I'll take that out of the HELOC as well, giving me a balance of about $18k and continuing to pay off a thousand a month or so.
Now mathematically, this is exactly what I intended. The roof is an unexpected expense, and the HELOC means I'm paying about 2.5% to finance it. That's better than keeping the money in cash, losing the 25% deduction from putting it in the 401(k) to say nothing of the investment returns it will eventually accrue. My net worth is going up, even with this expense. I'm not in danger of losing the HELOC - I've got $70k in equity in the home. So I feel comfortable that I can do this and even should some other emergency come up, I've still got over $10k of room. And that's quick to access - just log onto my bank's website and transfer the money to checking and it's ready to go.
But emotionally, I'm having some trouble pulling the trigger on the roof. I just got that HELOC paid off. I really don't like the idea of having a large balance again. It feels like I'm sliding backwards. I'm getting estimates on the roof work, and in the evenings I'm creating different reports in Quicken, trying to find one that helps me feel as good about this as I think I do.
One day, I think I'd like to have a cash emergency fund again. But it won't be until I can build it up with money after I have maxed my retirement accounts and paid off all existing debt. That's going to be a few years, so I just have to be patient and keep my eye on my ever-growing Stash. :)