Mid-February is upon us, which means that the referral fee changes in baby, grocery, furniture, and other areas that Amazon previously announced are soon to take effect.

If you use Amazon fulfillment or have products stored at Amazon's warehouses, however, you should know that there are other changes to fees also taking effect this month—changes that affect what you'll pay to store items at Amazon and to have Amazon fulfill your orders.

Changes to Amazon Fulfillment Fees

While Amazon's fulfillment fee structure isn't being entirely overhauled and the planned changes are in most cases not radical, some sellers will be affected. Here are the details in brief:

Do you sell on Amazon or use Amazon fullfillment for your orders? If so, this month's fee changes may help—or harm—your bottom line. (Image: © Ifeelstock / Dreamstime)

• Small standard size tier: Packages weighing 10–16 ounces will see a base rate increase of $0.07/unit, to $2.48/unit.

• Large standard size tier: Packages weighing 10–16 ounces will see a base rate increase of $0.09/unit, to $3.28/unit. Packages weighing 1–2 pounds will see a base rate increase of $0.05, to $4.75/unit. Packages weighing more than 2 pounds will see a base rate increase of $0.17, to $5.26/unit.

• Small oversize tier: Packages in this tier will see a base rate increase of $0.13, to $8.26/unit.

• Medium oversize tier: Packages in this tier will see a base rate increase of $0.35, to $9.79/unit, as well as a per-pound rate increase of $0.01, to $0.39/pound over the first 2 pounds.

• Large oversize tier: Packages in this tier will see a base rate increase of $2.60, to $75.78/unit.

• Special oversize tier: No change.

Sellers of items weighing 10 ounces or less or items in the special oversize tier fare the best, with no fee changes to these items; everyone else will see increases, ranging from $0.05/unit to $2.60/unit, depending on the size of the product.

Like the previously announced referral fees, Amazon says that this new fulfillment fee structure is effective February 19th, 2019.

Changes to Amazon Storage Fees

Long-term storage fees for inventory in Amazon warehouses are also set to change. Not everyone will be affected. From those that are, some will see increases, while others will see decreases Here are the details in brief:

• Monthly fees for non-flammable, non-aerosol items: No change.

• Monthly fees for flammable or pressurized aerosol items: Items in this tier will see a $0.30/unit monthly fee increase from January–September and a $1.23/unit monthly fee increase from October–December.

• Long-term storage fees, 181–365 days: Items that have been in a fulfillment center from 181–365 days will no longer incur fees for storage.

• Minimum long-term storage fees, 365 or more days: Items that have been in a fulfillment center for more than 365 days will see a reduction in the minimum long-term storage fee, from $0.50/unit monthly to %0.15/unit monthly.

Amazon says that the new storage fee structure is effective February 15th, 2019.

Study the Numbers

Whether or not these changes to Amazon's referral, fulfillment, and storage fees are a net increase for you or a net decrease for you will depend on the products you sell and the rate at which you sell them.

So visit Amazon's own page about the changes, study them, and then make adjustments to your business as necessary—using inkFrog to synchronize any multi-channel changes across marketplaces, naturally.