It is suggested to re-pot houseplants in spring before new growth starts. Always check the care instructions for your plant because some plants, such as those that are winter flowering, are best repotted in the fall.
Repotting can benefit the health of your plant by giving it room to grow and allowing more air to get to the roots. Repotting may also prevent the plant becoming root-bound or waterlogged. Actively growing houseplants may be repotted once a year.
Your plant may need repotting if there are roots coming through the hole in the bottom of the pot, or if you see more roots than soil when you slip the plant from the pot.
Tips for repotting:
When you repot a plant choose a slightly larger pot and be sure it is clean. When you re-use a pot be sure to clean it well, scrape off any mineral deposits, and soak it for at least 10 minutes in a solution of 1 part bleach to 9 parts water.
Water the plant while still in the old pot.
Prepare the new clean pot: Cover the drainage holes with a porous material such as a coffee filter. Layer in the potting soil in the pot.
Gently remove the plant, then untangle the roots and remove any dead ones. Place the plant in its new pot.
This is also a good time to do any other pruning that may be required.
These articles provide detailed tips on repotting: