PER CURIAM.

In these consolidated cases, respondent, City of Wyoming, appeals as of right the November 2, 1992, opinion and judgment of the Tax Tribunal that incorporated by reference the proposed judgment of the hearing officer of the Tax Tribunal modifying the special assessments imposed by respondent on parcels of land owned by petitioners. We reverse.

Respondent contends that the Tax Tribunal erred as a matter of law when it made a determination de novo of the existence and extent of special benefits following petitioners' presentation of an unpersuasive appraisal. We agree.

Municipal decisions regarding special assessments are presumed to be valid and, generally, should be upheld absent a substantial or unreasonable disproportionality between the amount assessed and the value that accrues to the land as a result of the improvements. Dixon Rd Group v Novi, 426 Mich. 390, 402-403; 395 N.W.2d 211 (1986). To challenge effectively special assessments, petitioners, at a minimum, must present credible evidence to rebut the presumption that the assessments are valid. Without such evidence, the Tax Tribunal has no basis to strike down special assessments. Kadzban v Grandville, 442 Mich. 495, 505; 502 N.W.2d 299 (1993).

The Tax Tribunal must conduct a proceeding de novo at which the petitioner bears the burden of proving the special assessments are invalid. MCL 205.735(1): MSA 7.650(35)(1); Kadzban, supra at 505, n 5, 508-509, 512; Dixon, supra at 401. If a petitioner fails to meet the burden of proving the special assessments invalid, the tax tribunal may not make a determination de novo of the benefit and substitute its judgment for that of the municipality. Kadzban, supra.

In this case, the hearing officer specifically determined that the value report of petitioners' appraisers was unpersuasive. Despite this determination, the hearing officer concluded that, under Dixon, petitioners met their burden of proving the illegality of the special assessment by simply presenting an appraisal that indicated an increase in value that differed from respondent's determination of value. However, Kadzban subsequently clarified that

our decision [in Dixon] did not alter the degree of deference that courts afford municipal decisions. When reviewing the validity of special assessments, it is not the task of courts to determine whether there is "a rigid dollar-for-dollar balance between the amount of the special assessment and the amount of the benefit." . . . Rather, a special assessment will be declared invalid only when the party challenging the assessment demonstrates that "there is a substantial or unreasonable disproportionality between the amount assessed and the value which accrues to the land as a result of the improvements. [ Kadzban, supra at 502.]

As noted above, special assessments are presumed to be valid. Thus, to effectively challenge special assessments, plaintiffs, at a minimum, must present credible evidence to rebut the presumption that the assessments are valid. Without such evidence, a tax tribunal has no basis to strike down special assessments. [ Id. at 505.]

Because petitioners failed to meet their burden of proving the special assessments invalid, the Tax Tribunal had no basis to make a determination de novo of benefit and to substitute its judgment for that of the municipality. Accordingly, the Tax Tribunal erred as a matter of law in modifying the special assessments imposed by respondent. Daguanno v Dep't of Treasury, 203 Mich. App. 130, 133; 512 N.W.2d 32 (1993).

Given our resolution of the case, we need not address the remainder of the issues raised by respondent.

Reversed.