Ind. Code § 6-1.1-3-6

Sec. 6. Not later than thirty (30) days before the filing date of each year, the appropriate township assessor, or the county assessor if there is no township assessor for the township, shall provide notification to each person whose personal property is subject to assessment for that year. The notification must include the date that personal property tax returns are due, the telephone number and electronic mail address of the assessor's office, and instruction to the taxpayer on how to obtain the appropriate personal property tax forms. The notification must be sent by mail unless the taxpayer consents to receiving it by electronic mail. Consent to receive notification via electronic mail remains in effect, unless the consent is revoked during the calendar year immediately preceding the filing year.