That is burn... sunburn or light burn from being too close.

That's weird. The problem only started when I brought the tree indoors, where it's been getting less sunlight. Can I move it further from the window without it getting too little light?

It is not salt; it is a burn... sunlight or plant light; but it is burn.

why do you say sunburn? I would have said salt too because it is on the edge of the leafs while sunburn would be more centered?

Salt begins at the tip; burn is on the sides... watch and learn... experience is the teacher.

I would expect sun or light burn to be at the center raised area of the leaf, not the margins. That is what my experience has taught me.

I'll try flushing the soil and see if that helps. To me, salt burn sounds more likely since the plant has been indoors and I haven't had any special lighting on it. Thanks for the advice!

Look at the color of the leaf, the crinkling... both indicate overfeeding, which means overly sensitive; sunburn or light burn occurs on the thinnest part of the leaf, which is the edge. Anyone who wants to treat this as salt burn will be wasting their time; but luckily, it will be THEIR time and not mine.

"Look at the color of the leaf, the crinkling... both indicate overfeeding, "

if its overfed, would not flushing it with water help ?

isnt overfeeding the same as salt burn ?

If leaves are still turning brown after the poster brought the plant inside, i would say flushing with water is probably a good idea. If there is some extra ferts in the soil, it wont need them in winter/inside anyway

Flushing will not solve the problem of the ferts already in the leaf; flushing will remove excess ferts in the medium. Yes, overfeeding is similar to salt burn; but the photos of the OP do not show salt burn; they show sunburn/light burn.

The leaves being that pale and the the tightness on them look likes root damage. They key is finding out 'why'?

Did that leaf you are showing do that after or before you brought it inside, I don't remember..?

What kind of mix are you using? How long is it taking before it dries out?

Where do you live and what Zone area? Are you putting that tree under lights or bringing it inside from the hot sun?

How much fertilizer do you feed it and how often? Do you spray your leaves with anything" , how about recently?

Can you take a picture of the pot, the mix, and the whole plant?

I think it's a good idea before to give us as much detail about your care and where it resided and where it is now before you get a concrete answer..

The leaves started Browning like that after I brought it inside. It hadn't been under any kind of special light, just near the window. I did get a lamp for it because I was concerned it wasn't getting enough sunlight. But I've only had it for about a day.

I'm in Nashville which I believe is zone 7a.

I haven't fertilized in several weeks. When I do I use foliage pro 9-3-6. K spray the leaves with neem oil.

It takes awhile to dry out. I water roughly once a week. Here are photos of some more leaves and the plant. Thanks for all the advice!

Do you have water softener? For me still looks like salt built up. Could be salt from water softener

It's hard to tell but is that an induction unit/forced-air (heat and/or AC) unit under the window sill? I know the leaves on my coffee plant start doing that if it gets dry around them and wonder if air is blowing out of that and maybe desiccating the leaves?

I do think we have soft water here. I'm not sure if that's from a water softener or just the quality of the water, though. If that's the issue what should I do? Should I be treating the water with something?

That unit is a forced air heat/AC unit. However it hasnt been turned on for awhile.

It is important that you find out if you have a water softener. If you do, you must find a source of untreated water.

If you do not have a water softener, then the water supplied by your municipality is probably OK.

Rainwater (what I use mostly), distilled water or reversed osmosis water. With those choices you can be sure there will be no damage from water.